Over at iFilm I found a Halo Physics Experiment video. It is taken in one of the early levels in Halo on the island beach. The person filming the video throws grenades under warthogs and blows them up in the air and over the cliff above. Pretty amazing stuff. When I remember playing that level in Halo I drove the warthog all the way out into the ocean until I hit the end of the level (not quite the same I know). In the same vein Bungie actually went and made a Warthog Flash Game where you set grenades under the Warthog and blow it up attempting to destroy a bunch of aliens in one shot.

Watch the Warthog fly.