Surprised this hasn't been posted on KB yet. Stunt Experts would spend days, weeks practicing to pull off this trick;

bike rear ends car- rider somersaults- lands perfectly balanced on car roof

Ok it's not really a stunt, it's a crash in this instance. But IF he intended to do this, then well done, that man deserves a beer.

http://www.stuff.co.nz/motoring/vide...er-rear-ending