Banshee Smash
Here's a trick I've done on the multiplayer map "Congulation."
For this, you'l need 2 players, one in a banshee and one standing on flat ground.
Fly the banshee over the player on the ground (go as high as you can), when above him/her, turn the bashee so it is aiming stright downwards, (hopefully right at the 2nd player), if so, speed boost straight down at them and hey presto! If done right, the 2nd player will have fallen through the ground and fallen to their death.
I've only tried this on the game and not on Xbox Live.
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