Gallery of shaken faces

This gallery of "shaken face" photos is very strange and funny. From the FAQ:

2. How do I make one?
Start by loosen up your muscles. Then we recommend using one of two techniques: Prrr or Shaken.
- To Prrr you hold your lips together and say 'prrrr', just like a horse on a sweet summer day.
- To Shakit you just shake your face from side to side and let those cheeks fly free.
Sometimes you drool, but thats perfectly normal...

4. Does it hurt?
After a couple of hard shakes you can indeed feel a bit dizzy or drowsy. If so, just wait for a minute, then start again.

Link (via MetaFilter)

UPDATE: BB reader Phil Williams points us to another excellent gallery of shaken faces, aka "jowlers." Link