At one point during the filming of The Jazz Singer, Al Jolson called out to the technicians and extras on the set, "Wait a minute! Wait a minute! You ain't heard nothin' yet!" His unscripted words, due to be cut from the sound track, were left in at the last minute and soon became part of cinematic history.

[A 1969 BBC telecast of The Jazz Singer was stopped for ten minutes while executives decided whether or not to continue. If Jolson's classic line ("You ain't heard nothing yet") was deemed to constitute an ad for his music, airing it would contravene the BBC's policy not to screen films in which products were advertised. (Karnataka Quiz Association)]