“The commentators have fixed the month for me, they have chosen the date and the day. But I advise them: "Don't count your chickens before they are hatched." Remember what happened to Marie Lloyd. She fixed the day and the date, and she told us what happened. As far as I remember it went like this: 'There was I, waiting at the church–' (laughter). Perhaps you recall how it went on. 'All at once he sent me round a note. Here's the very note. This is what he wrote: "Can't get away to marry you today, my wife won't let me."' Now let me just make clear that I have promised nobody that I shall be at the altar in October? Nobody at all.”

"Mr Callaghan renews plea for 5% pay guideline", The Times, 6 September 1978, p. 4.
Speech at the Trades Union Congress, 5 September 1978. Callaghan was teasing the audience about the date for the impending general election. Although his message was intended to convey that he may not call an election in October, many people interpreted him as saying that the opposition would be caught unprepared by an October election.
Callaghan deliberately misattributed the music hall song "Waiting at the Church" to Marie Lloyd rather than to its real singer, Vesta Victoria, knowing that Vesta Victoria was too obscure for the audience to recognise.