I'm not talking about in the game. Like for example, your TV falls on and breaks your foot. Here's my story: I was playing Prince of Persia (this was during winter break) and my controller is kind of messed up so the buttons aren't very responsive, precise actions like multiple wall jumps were VERY hard to do. Anyway I was on the last level and was really pissed off about this stupid controller, and I developed like this jaw clenching condition in my frustration. Now whenever I move my mouth, my jaw sounds like a cement grinder.