In this Mythbusters holiday special television show, Jamie Hyneman and Adam Savage capitalize on the reaction from dropping Mentos in Cola to power this fun and comical elaborate piece of machinery.

A Rube Goldberg machine or device is any exceedingly complex apparatus that performs a very simple task in a very indirect and convoluted way. Rube devised such pataphysical devices. A Rube Goldberg machine usually has at least ten steps. The best examples of his machines have an anticipation factor: the fact that something so wacky is happening can only be topped by it happening in a suspenseful manner. One story about Rube Goldberg holds that, while sleep-walking barefoot in a cactus field, he screamed out an idea about a self-operating napkin. - Wiki

Related Links:
www.rube-goldberg.com
http://en.wikipedia.org/wiki/Rube_Goldberg