Play pranks with people around you, by playing prepared Creations recorded by you, with some funny effects added. Perhaps your phone is Darth Vader (Cold Metal effect).
You can mail the Creations to share them, or even create ringtones to drop on iTunes. (Ringtones requires an iPhone 3GS/4)
Also try the Live mode, hearing yourself in real time, with effects added! Very amusing amongst friends!
Note! To play a Creation during a call, so that caller can hear it, you have to use an iPhone 1G/3G/3GS, and hold your hand around the mic+speaker below the phone. See separate guide on our homepage.
Also see separate guide on our home page to get hints about how to get the ringtones into the Settings App.