Being a monkey would be pretty sweet, considering that you get to eat a lot of bananas, everything you do is hilarious, and if something is pissing you off, you can just throw crap at it. This dude really wanted to be a monkey, so he started walking like one.
Thanks for keeping it weird Japan.  This dude has spent the better part of 29 years studying monkeys and trying to run like them.  Can you imagine someone trying to pull this in Flint, just running around on all fours?