something i discovered on halo 2 that i don't want to lose

First you have to get in the passenger seat of the warthog, then you have to press and hold the white and black button, then when you exit the warthog you have to hold up on the D-pad and continue to hold up until your screen starts to shake. Once your screen is shaking then you know that you've accomplished the dummying, at this point you can wonder around the board invisable and invincible. This works really well on slayer because you can't be killed but you can do a lot of killing.