Pinch your friends and watch them in motion. iPinch is amazingly fun.
Here is how iPinch works: step 1 - take a picture or select one from your photo album; step 2 - pinch, pinch, i pinch; step 3 - capture the screen shot to your photo album and email to your friend ;)
iPinch can track up to 5 multi-touch points when you drag or pinch the picture. When touch stops, all the points will snap back and bounce like crazy.