Annoy your friends! Enrage your enemies! Bore yourself to tears! This application does just one utterly pointless thing: it sings the entire song "99 Bottles of Beer on the Wall" (starting with 99 bottles and ending when no bottles remain) in an artificial-sounding computer-generated voice.
On the screen, 99 bottles are displayed. As the song reaches the phrase "take one down", you tap a bottle (or, in autoplay mode, a bottle is randomly chosen) and it is taken down and removed from the screen. The count of remaining bottles is also shown. So you can be bored watching the screen as well as listening to the song.
If 99 bottles is just too many — perhaps youre in a hurry? — you can start with fewer bottles in various amounts down to 1.
Please, for your own safety, if you must sing along, sing responsibly.