This has been aroudn for a few years now, but it's still cute to stumble over once in a while:
http://www.albinoblacksheep.com/flash/honda.php
This Rube Goldberg-esque setup was shot live, with no CGI or other digital manipulation. Even the tires rolling up an incline is real - they had weights taped inside them and were balanced just so. It took them 606 takes to get it right. I'm amazed they got it in so few tries.