I've just come out of a game of Modern Warfare 2. It originally said it was a team deathmatch and then the screen said "changing level". When the level reloaded it was still in team deathmatch mode, but it shouted "free for all". Next thing, friendly fire is on and every time you killed someone you got thisL

When I come out of the game, I've suddenly jumped to Level 70 and I've unlocked all the weapons (but none of the extras).

What's the weirdest glitch you've come across in a game?