A 'C', an E-flat, and a 'G' go into a bar. The bartender says: "Sorry, but we don't serve minors." So, the E-flat leaves, and the C and the G have an open fifth between them. After a few drinks, the fifth is diminished: the G is out flat. An F comes in and tries to augment the situation, but is not sharp enough.
A D comes into the bar and heads straight for the bathroom saying, "Excuse me. I'll just be a second." An A comes into the bar, but the bartender is not convinced that this relative of C is not a minor. Then the bartender notices a B-flat hiding at the end of the bar and exclaims: …