The 'Warn Markiplier' meme stems from various screenshots of the famous YouTuber during his iconic horror game playthroughs, particularly Five Nights at Freddy's. The template captures the comedic tension of a viewer seeing a threat that the gamer has yet to notice. It usually features Markiplier focused on the camera or his gameplay while a monster, ghost, or humorous object is edited into his background. This evolved into a meta-joke, frequently paired with the 'he has headphones on' trope, symbolizing moments of oblivious danger or dramatic irony within the gaming community.