HQ9+

A programming language that can do exactly 4 things:

H      Prints "Hello, world!" Q 	Prints the entire text of the source code file. 9 	Prints the complete canonical lyrics to "99 Bottles of Beer on the Wall" + 	Increments the accumulator.

So the source code for the famous "99 bottles of beer"-program is simply: 9. ;)


 * http://www.cliff.biffle.org/esoterica/hq9plus.html