Jan. 6, 2026

The Psychology of the Slender Man Obsession

The Psychology of the Slender Man Obsession

In the latest episode of Among Monsters, we delved into a case that continues to send shivers down the spines of many: the Slender Man attack. Click here to listen to "The Slender Man Attack: Morgan Geyser & Anissa Weier" and hear the full story. This blog post expands upon the themes explored in the episode, dissecting the psychological factors that may have contributed to the unthinkable actions of Morgan Geyser and Anissa Weier. We will explore how the power of belief, peer dynamics, and underlying mental health vulnerabilities can tragically intersect, leading to devastating consequences. Join us as we navigate the unsettling reality where fantasy morphed into a nightmare, forever altering the lives of all involved.

The Chilling Case of the Slender Man Attack

The Slender Man attack is a harrowing example of how online myths and legends can permeate reality, particularly within the susceptible minds of adolescents. In 2014, the quiet town of Waukesha, Wisconsin, was shaken by a crime that seemed ripped from the pages of a horror novel. Two twelve-year-old girls, Morgan Geyser and Anissa Weier, lured their friend into a wooded area and subjected her to a brutal attack, stabbing her nineteen times. Their motive? To appease the fictional internet boogeyman known as Slender Man.

This case is not merely a story of juvenile delinquency; it's a complex exploration of the psychological landscape of adolescence, the power of suggestion, and the potentially dangerous influence of the internet. It raises disturbing questions about how vulnerable young minds can become entangled in elaborate delusions, blurring the lines between fantasy and reality with tragic consequences.

The Crime: Fantasy Turns to Reality in Waukesha

On May 31, 2014, Morgan Geyser and Anissa Weier invited their friend, Payton Leutner, to a local park for a day of play. Unbeknownst to Payton, this innocent outing was meticulously planned to culminate in a heinous act. After spending the day at the park, the girls led Payton into a nearby wooded area under the pretense of playing hide-and-seek. It was there that Morgan and Anissa attacked Payton, stabbing her multiple times. They left her for dead, believing that sacrificing her to Slender Man would protect themselves and their families.

Miraculously, Payton survived the attack. She crawled out of the woods to a nearby road, where a cyclist discovered her and called for help. The swift response of emergency services and Payton's own resilience saved her life. However, the physical and emotional scars of the attack would undoubtedly remain for years to come.

Meanwhile, Morgan and Anissa were apprehended shortly after the attack. Their initial statements to the police revealed the shocking motive behind their actions: they believed that Slender Man was real and that they had to kill Payton to prove their loyalty to him. They also claimed that Slender Man would harm their families if they failed to carry out his orders. The details of the crime and the girls' justifications painted a chilling portrait of delusion and obsession.

Who are Morgan Geyser and Anissa Weier?

Understanding the backgrounds and personalities of Morgan Geyser and Anissa Weier is crucial to comprehending how they became entangled in the Slender Man myth. Both girls were twelve years old at the time of the attack and were described as being bright but socially awkward. Morgan, in particular, had a history of mental health issues, including auditory hallucinations and delusions. She had been diagnosed with early-onset schizophrenia, which likely played a significant role in her susceptibility to the Slender Man myth.

Anissa, on the other hand, came from a stable family environment but was described as being highly impressionable and eager to please. She looked up to Morgan and was easily influenced by her beliefs. Anissa's desire for acceptance and her susceptibility to peer pressure may have contributed to her participation in the crime.

It's important to note that neither girl had a history of violence or criminal behavior prior to the Slender Man attack. Their transformation from seemingly normal children into perpetrators of a horrific crime underscores the power of belief, delusion, and peer influence, especially in the context of adolescent vulnerability.

The Birth of a Myth: Slender Man's Origins

Slender Man originated in 2009 as a meme on the Something Awful internet forum. Created by Eric Knudsen (under the pseudonym "Victor Surge"), Slender Man was depicted as a tall, thin, faceless figure in a black suit who stalks and abducts children. The character quickly gained popularity, spawning countless stories, images, and videos across the internet. Slender Man became a symbol of internet horror, capturing the imaginations of many, particularly young people.

The appeal of Slender Man lies in his enigmatic nature and the ambiguity surrounding his origins. He is a blank slate onto which people can project their fears and anxieties. The open-source nature of the character allowed for endless interpretations and adaptations, further solidifying his place in internet lore.

However, the fictional nature of Slender Man was not always clear to everyone, particularly to those with pre-existing mental health vulnerabilities. For individuals like Morgan Geyser, who struggled with distinguishing between reality and fantasy, the line between internet myth and real-world threat became dangerously blurred.

Psychological Factors at Play

The Slender Man attack underscores the complex interplay of psychological factors that can contribute to such extreme behavior. In this section, we will delve into the key elements that likely played a role in shaping the perceptions and actions of Morgan Geyser and Anissa Weier.

The Power of Belief in Adolescent Minds

Adolescence is a critical period of development characterized by heightened suggestibility and a search for identity. During this time, young people are particularly vulnerable to the influence of beliefs, especially those that resonate with their fears, anxieties, or desires for belonging. The belief in Slender Man provided Morgan and Anissa with a sense of purpose and a shared identity, albeit a distorted and dangerous one.

The power of belief is amplified by the confirmation bias, a cognitive bias that leads people to selectively seek out information that confirms their existing beliefs, while ignoring or dismissing contradictory evidence. Morgan and Anissa likely immersed themselves in Slender Man content online, reinforcing their belief in his existence and his malevolent intentions.

Peer Influence and Shared Delusions

Peer influence is a powerful force during adolescence. The desire for acceptance and the fear of rejection can drive young people to adopt the beliefs and behaviors of their peers, even if they are questionable or harmful. In the case of Morgan and Anissa, their shared obsession with Slender Man created a bond between them, reinforcing their belief in the myth and their commitment to carrying out his supposed demands.

The concept of shared delusion, also known as folie à deux, may also have played a role in the Slender Man attack. Shared delusion occurs when two or more individuals develop a shared delusional belief system, often as a result of close social interaction. Morgan's pre-existing mental health vulnerabilities likely made her more susceptible to delusional thinking, and Anissa's impressionability allowed her to adopt and reinforce Morgan's beliefs.

Mental Illness and Vulnerability

Morgan Geyser's diagnosis of early-onset schizophrenia is a crucial factor in understanding her involvement in the Slender Man attack. Schizophrenia is a chronic mental disorder characterized by hallucinations, delusions, disorganized thinking, and impaired social functioning. These symptoms can significantly impair an individual's ability to distinguish between reality and fantasy, making them more vulnerable to the influence of delusional beliefs.

While Anissa did not have a diagnosed mental illness, her personality traits and social dynamics with Morgan made her susceptible to being drawn into Morgan's distorted reality. This highlights the importance of recognizing and addressing mental health vulnerabilities in adolescents and providing appropriate support and treatment.

Inside the Investigation: Court Records and Psychological Evaluations

The court records and psychological evaluations from the Slender Man case provide valuable insights into the mental states of Morgan Geyser and Anissa Weier. These documents reveal the extent of Morgan's delusions and hallucinations, as well as Anissa's susceptibility to peer influence and her understanding of the wrongfulness of her actions.

The psychological evaluations conducted on Morgan indicated that she was actively experiencing psychotic symptoms at the time of the attack. She reported hearing voices and seeing visions of Slender Man, which she believed were real. The evaluations also highlighted her impaired judgment and her difficulty understanding the consequences of her actions.

Anissa's psychological evaluations revealed that she was aware that stabbing Payton was wrong, but she believed that she had no choice but to obey Slender Man's orders. The evaluations also indicated that she felt remorse for her actions and that she understood the harm she had caused to Payton.

The court proceedings ultimately resulted in Morgan being found not guilty by reason of mental disease or defect and being committed to a mental institution for long-term treatment. Anissa pleaded guilty to second-degree attempted intentional homicide and was sentenced to a mental institution as well. The legal outcomes reflected the complex interplay of mental illness, culpability, and the need for treatment and rehabilitation.

The Victim's Testimony: A Survivor's Perspective

Payton Leutner's survival and her subsequent testimony offer a powerful perspective on the Slender Man attack. Despite the trauma she endured, Payton demonstrated remarkable resilience and courage. Her willingness to speak out about her experiences has shed light on the devastating impact of the crime and the importance of supporting victims of violence.

Payton's testimony revealed the extent of the betrayal she experienced at the hands of her friends. She described the events leading up to the attack, the brutal nature of the stabbing, and her struggle to survive. Her story is a testament to the strength of the human spirit and the power of hope in the face of unimaginable adversity.

Payton's story serves as a reminder of the real-world consequences of online myths and the importance of protecting vulnerable individuals from harm. Her resilience and her commitment to healing have inspired many and have helped to raise awareness about the psychological impact of violence.

Monsters in the Mind: The Haunting Reality

The Slender Man attack is a stark reminder that monsters don't always lurk in the shadows; sometimes, they reside within the human mind. The case highlights the dangers of unchecked delusions, the power of peer influence, and the vulnerabilities of adolescent minds. It underscores the importance of mental health awareness, early intervention, and critical thinking skills in navigating the complexities of the digital age.

The case also raises ethical questions about the responsibility of internet content creators and the potential harm that can be caused by online myths and legends. While freedom of expression is essential, it is equally important to be mindful of the potential impact of content on vulnerable individuals and to promote responsible online behavior.

Conclusion: Lessons from a Tragedy

The Slender Man attack remains a chilling example of how fantasy can intertwine with reality, leading to tragic consequences. As we explored in our podcast episode, "The Slender Man Attack: Morgan Geyser & Anissa Weier," this case highlights the vulnerabilities of adolescent minds, the power of belief, and the potential impact of mental health issues. By understanding the psychological factors at play, we can better equip ourselves to prevent similar tragedies from occurring in the future. This requires promoting mental health awareness, fostering critical thinking skills, and encouraging responsible online behavior. The memory of Payton Leutner's resilience serves as a powerful reminder of the importance of empathy, support, and the unwavering pursuit of hope in the face of adversity. Ultimately, the Slender Man case urges us to be vigilant in protecting our youth and nurturing a world where understanding and compassion prevail over fear and delusion.