Pyrochondria

The condition of always falsely believing yourself to be on fire. The concept originated from a player in Black Cat Blues who would say "You're on fire!" after anyone was asked to make a Perception roll.

Of course, the one time I actually asked this player to make a Perception roll to notice that he was, in fact, on fire, he didn't say the thing and just looked at me blankly when I tried to elicit it out of him. It figures.