He'll backflip anything that rolls.

Tricycle on MEGA Ramp - Travis Pastrana (backflip) - video powered by Metacafe
I'm sure you've seen this video before since it is a few weeks old already (yeah, I should have posted it when I first seen it when it was still new but I had something else going on. Like what? I'm not sure but it probably wasn't that great.). Basically, if you give any rolling object to Travis Pastrana and a big enough ramp (seriously the ramp in the video is huge, I hope it wasn't built solely for this stunt because that would be a waste of a huge ramp. I mean you could take a skateboard down it, a bike, a motorcycle, and/or probably a battleship) and he'll do a backflip. I'm just waiting for the video of him backflipping his rally car.