APP NAME: iFart Mobile
WHAT IT DOES: Plays a wide variety of flatulence sound effects labeled with names like "Burrito Maximo" and "Forrest Dump." Available for iPhone and iPad, too.
LEMON FACTOR: By now, this and other similar crude-sound apps have become a staple for giggling kids. But 99 cents to enable some of the most powerful mobile computers ever created to perform something your kooky uncle will do for free? Not iWorthy.