Halo 2: Glitch - Grab The Flag (Beaver Creek)

In Beavercreek there is a flag-through-wall glitch. Have one of your teammates behind the enemy base. He should teleport there and remain in the receiving teleporter, preferably in the corner facing the back wall of the base.

Have someone else on your team (or just you) enter the enemy base to grab the flag as normal. Face your buddy's icon and press either trigger to drop the flag. Provided the player standing on the teleporter is holding the X button, he may occasionally grab the flag right through the wall.