Halo 3 Easter Egg - Assult Bomb

1. Go to custom games, and start a match of Assault. It does not matter what level, just any assault game type.
2. once you're in game, pick up the bomb and then end the game.
3. Go to the theater and watch your character just after he picks up the bomb. Right when you see yourself pick it up, you should be able to see the back of the ball.
4. If you look at the top of the ball, there it is, in white writing "HOLD ONTO YER BUTT"