Square gears. Oval gears. Friggin goldfish and squid gears. My brain says none of these should work, but my eyes beg to differ. It feels like I'm breaking the rules.
Every time Clayton Boyer whips out another one of these, I'm confident that it's going to fail. And yet! Here's to living in a state of constant surprise and wonder. Now I just need a seashell gear-powered watch and I'll be set. [YouTube via Reddit]