In Roleplaying Games (RPGs), to become attached to your player character(PC) to an unhealthy extreme. The phrase refers to a line from the 1984 film "Mazes and Monsters". In the film, Tom Hanks' character's PC is killed during an RPG game, causing him to have a severe emotional breakdown, and eventually wail "There's blood on my knife!" at the film's climax.
"I'm sorry I screamed at you. There's blood on my knife."
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