http://www.youtube.com/watch?v=lN6GwmW3vbw
This is a video that teaches you 10 quick and easy practical jokes to play on friends, CAUTION: do these at the risk of losing their friendship.
Here is the link to the dog on a unicycle doing a back flip.
http://www.youtube.com/watch?v=nZE8Hn4K_NQ
