Why is this funny?

Alright, this was made as a animation project at the University of Ontario Institute of Technology by a student named Colin Sanders.  One of my buddies showed this clip to me and the first time around I couldn't really register what I just saw.. but second time around...

It may just be my type of humour.

I hit the replay button many times...

Video: http://www.youtube.com/watch?v=FiARsQSlzDc

It's.. I don't know..

Hilarious!