From Jimmy Kimmel Live:

A Rube Goldberg machine is a machine that accomplishes a simple task in as complicated a way as possible. Every year Purdue University holds a Rube Goldberg Machine Contest. Teams of college students from all over the country design and build these machines and enter them in the competition. We invited this year’s winners from Purdue University to show off their creation on the show.

[Jimmy Kimmel Live | Via Neatorama]