This interesting film is a work by Fancy Pants.
This initially started out as a Faceposer test video made with audio clips taken from two YouTube users that battled each other, and was largely incomplete until it took a turn down randomness lane mid-production. It's now more of a mixture of a Faceposer test and Garry's Mod footage.
Realizing that some people may not like this video, Fancy Pants promised that he will not make another like this one.
If you want to see what else he's made, check out his YouTube page.