Hangtime!

Best disclaimer ever "WARNING: Whatever you do, do not THROW YOUR PHONE IN THE AIR. It would definitely be a bad idea, no matter how much fun it is. Sure, this app works well for that, too, but it's a bad idea. Throwing phone, bad. Effective, but bad. Awesome, but bad."

And for the Android folks: S.M.T.H. (Send Me To Heaven)