My friend John and I play Halo 2 a LOT, and we have found a TON of glitches and Easter eggs, but this one tops them all. So we get the sputnik skull and go to the level Metropolis. We ditch the tank and get in a warthog and take the marines Rocket Launcher. I (holding the rockets) get in the passenger side and He starts driving. I shoot the ground (while in the hog) and it sends us flying through the air. It is my FAVORITE Halo 2 memory and if you haven't tried it yet, DO IT!