Here’s a neat website with a little shopping cart that’s a Rube Goldberg like contraption.
A Rube Goldberg machine is described by Wikipedia as:
an extremely complicated apparatus that performs a very simple, easy task in an indirect and convoluted way. The most horrible examples of his machines have an anticipation factor, as the machine makes slow but steady progress toward its goal.
Thanks to Matt for the original link!
UPDATE: 10/05/09 Ten food related Rube Goldberg machines