The 'Don't Do X / Running Peter' meme originates from a scene in the Family Guy episode 'Internal Affairs,' where Peter Griffin is seen running frantically down a hallway toward the camera. On the internet, this visual has become the universal symbol for a desperate, high-stakes warning. Users typically pair the image with text advising others not to search for a specific term or engage in a certain activity, claiming it was the 'worst mistake' of their lives. It is frequently used to highlight disturbing internet shock sites, weird urban dictionary definitions, or ironic jokes about niche pop culture trivia that once seen, cannot be unseen.