Fart apps for the iPhone: Big red button in the center of the screen that says "fart." Cost: $0.99. Fart apps for the iPad: An array of buttons labeled thing

Fart apps for the iPhone: Big red button in the center of the screen that says "fart." Cost: $0.99. Fart apps for the iPad: An array of buttons labeled things like "squeeker" and "poot" and "low rumble" and "Shock and and Awe." Plus controls for volume, stereo center, and a time line editor for layering multi-channel, multi-event sequences. Cost: $4.99.