Viral videos

Viral videos are those YouTube-type videos that people can't resist sending to each other. For instance, the Susan Boyle audition on Britain's Got Talent has registered nearly 70-million hits so far, and rising. But apart from the occasional ones that the media pick up on, how do you find these treasures? A website called butterscotch.com has done some of the hard work for you. They have a regular blog picking out some of the best.
And to give you a bit of light relief, here are some links to a few of the best that I have come across:
Matrix-style table tennis
Bob Newhart - "stop it"
The Two Ronnies Mastermind
Russian portable toilet practical joke
Parkour - free running