There are tons of apps designed to make noises that are either appropriate to a given situation, or completely random. Choose the right app and your iPhone can moo, cry, make sad trombone sounds or, of course, fart. Moop Sounds Funny makes our list because it goes most of the others one (or several) better. You want farts? You got 'em. No less than 16 distinctive fart sounds will thrill your friends, assuming they like that sort of thing.
There are sound effects for almost any situation. A drum roll for the amazing feat or a rimshot to mark a funny line or comeback. The obligatory "splat" is here; along with the sad trombone "wa-wa-wa-wa" which is useful for highlighting those moments when someone fails rather badly. A very lifelike "ohh" is included for the three-foot putt that rings the cup then hangs on the edge for a double bogey. You get the idea.
At $1.99, this app may seem a bit pricey for what it does, but can you really put a price on funny, odd and disgusting sounds? Ask yourself that question and let the answer be your guide.