I'm addicted to watching Rube Goldberg machines, maybe because they represent the misspent effort that characterizes my life. Here are my thirteen favorites (there are, oh god, so many more on YouTube), including the classic Honda ad, a chain of chemical reactions, a machine in the forest, and a compilation of all those cute ones from the Japanese kids' show Pythagora Switch.
9. Cog Parody
Same as above, with two dudes subbing for most of the machine. Advertised a British phone service.
Tools: Crazy exercisers
Highlight: Dance party