The 'I Killed a Man' meme originates from a webcomic by Deathbulge, featuring two inmates in a prison cell sharing their crimes. While the first inmate confesses to murder, the second reveals a behavior so bizarre or socially unacceptable that it strikes fear into the hardened criminal. It became a viral sensation as a way to highlight 'unhinged' minor behaviors, niche preferences, or controversial takes that are jokingly framed as more dangerous than actual crime. The template is widely used across social media to poke fun at weird personality quirks or specific community taboos.