Number 7; said to have been an old joke in the music-halls at the time the play was written.
Quotes from The Entertainer — John Osborne
Attribution
Quotes and notes from Wikiquote: John Osborne (page history), available under CC BY-SA 4.0.
Quotes and notes from Wikiquote: John Osborne (page history), available under CC BY-SA 4.0.