In his new HBO documentary, Billy Joel addresses his feud with Elton John and talks about his career; however, it quietly ignores one major aspect of the musician's life.

There was once some “bad blood” between Elton John and Billy Joel.

One night in 1988, the few patrons at a Washington, DC restaurant got a surprise concert from one of the most famous musical artists in the world.

John’s full quote wasn’t exactly subtle. He blamed Joel’s alcoholism for tour cancellations, accused him of “coasting,” and described Joel’s rehab stints as “light,” quipping that when he went to rehab, he had to clean the floors, while Joel had TVs.