Hey, you know what's a renewable energy source? Electric eels, apparently. Thanks, Japan.
If looking into the electric eel's little, beady eyes or watching its creepy fins move doesn't scare you, watch it light up a Christmas tree every time it moves. That should do the trick. It's really cool to see, though, and the Enoshima Aquarium in Kamakura, Japan rigged an eel's tank up to do just that back in 2010. Watch and be amazed by nature.