Funny glitch story:
I have really no idea how I did this (it must have been a bug or something), but heck, I'll tell you anyway.
I was playing team assault on Xbox Live on the map Ivory Tower. I had a Needler and an SMG with me. I stepped into the "air" lift thing next to where you get the Plasma Pistol on the top floor (on the Sniper Rifle side.) For some odd reason, I could not move and was caught floating in mid air above the lift (what the heck?)! It was kind of cool at first (because I could assassinate some enemies that were going up the lift normally), but one brave player eventually killed me with a Battle Rifle. My dead body was laying limp in mid air (almost like it was on top of an invisible platform up there or something)...
Who knows?
Did I glitch my game, or... what happened?