Tommy starts to play the Twisted Sister track at the wrong speed (45rpm instead of 33 1/3). He stops halfway and slows it down and promises to play the full track at a later date. The incident is recounted in Dee Snider's book "Shut Up And Give Me The Mic."
(TV: 'One of the biggest disappointments I think, about that album is the fact that one of the best tracks on the album [Not Now John] has got so many expletives on it, you could never get away with playing it on the air. Never in a million years. A strange album: it's really The Wall, Part 2.')