It may have been in 3 Scary Games, or it may have been in an actual series of horror installments, like Darkwood, maybe. Mark approached a monster, and tried to shout “You think I’m stuck in here with you, you’re stuck in here with me!”, but he panicked, and it reversed and blended together into “YouThinkYou’reStuckInHereWithMeI’mStuckInHereWithYOUUUUUU!” and then “Wait...” as he realized what he said.