I love this video. I really like videos like these, that have no 'story' but are purely about the concept and idea. There's no climax or resolution, there aren't any obvious jokes, it's just, "hey what if I sat in the lotus position on a commuter train upside down on the celing?" I find that so hilarious and I love the subtle social commentary. Check it out:
Video: http://www.youtube.com/watch?v=KwGNahH_JFg
You'll Never Walk Alone.