Source: somewhere on the 'net.
Note: You won't get it unless you understand music theory.
Three notes walk into a bar, a G, an Eb, and a C.
The bartender looks up and says "We don't serve minors."
So the Eb leaves and the other two have a fifth between them.
After a few drinks, the G was out flat, and the whole experience was diminished.
Eventually, the C sobers up, sees one of his friends missing, the other one passed out, and a policeman standing over him. And to his horror he realizes that he's under a rest.
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