What's the funniest video you've ever seen (don't put inappropiate ones)

Perhaps because I did this to my roommates:

http://www.youtube.com/watch?v=Vw9VI546a-E

I saw this for the first time when I was in middle school. My friends and I literally, honestly, fell onto the floor in pure hysterics. I turn 11 again when I watch this video, and still can’t contain my laughter. I gotta give kudos to something that can make me laugh for 29 years!
Nat’l Geography Video

@Qingu your famous! and @linguaphile LOL!!! I LOVED THE PART WHERE HE WAAS RUNNING!!! FUNNY!!!!

Drive thru rap

http://www.youtube.com/watch?v=xhlUVyDBusg

I still love Will It Blend, Chuck Norris

Some of my favourites:

Don’t Be A Tosser (Canadian recycling ad).
Gatinho Ninja (cat in a box).
Canadian Police Chase (Canadian winter tire ad).
African Animals Getting Drunk From Ripe Marula Fruit (real video of animals getting intoxicated in the wild).
Fake Steering Wheel (automobile ad).
Hilarious Budweiser Commercial
Shoes (comedic music video).
Quadruplet Babies Laughing (video on Funniest Home Videos).
Hahaha (baby laughing).
Dramatic Look (funny prairie dog expression)
Dad at Comedy Barn (this is a video about a man’s laugh that took over the comedy show) ..you have to watch it all the way through ..lol.

Ultimate Dog Tease http://www.youtube.com/watch?v=nGeKSiCQkPw