The April 2005 issue of Classic Rock Magazine has the funniest article ever with interviews with some of music's biggest artists discussing their real life Spinal Tap moments.
If you read it my favorites are the stories about keith Moon pouring soup in a bag, pretending that he had vomited instead into the bag, in front of people, then drinking the "vomit".
Ozzy Osbournes story about locking his midget in the airline luggage compartment becaue the midget was drunk..and the midget's comments to the airline steward.
Elton John spaced out on cocaine "ordering" his manager to turn down the wind because it "annoyed" him.