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It's Bobby McFerrin, falling down all those stairs!! From the TV show Family Guy
I got annoyed at all the half arsed attempts at looping this clip, so I tried my own hand at it and this is the result. I just love it!.
It turns out it's hard to loop a clip well, even this clip has a lot of weird bits in it which don't flow, but it's better than the other ones I've seen