What is the funniest video clip you have ever seen?

I've got quite a few favorite ones, but i think the No. 1 has got to go to "mad dog with bone" on 'youtube.com', this dog has got a serious problem! Check it out and tell me what you think, do you know of a funnier 1?

This one gets me every time!
http://ie.youtube.com/watch?v=QqCBY5MqvE4&feature=related

(If the mad dog with bone you're talking about is the one with the dog biting his own foot, yep, it's funny! I still prefer my cow, though.)

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