A man walks into a pub with a toad and a frog.
The toad starts to play the piano – and the barman is astonished.
Then the frog starts to sing along, accompanied by the toad on the piano.
'That's amazing,' says the barman. 'I tell you what. I'll pay you £100 for the singing frog.'
'Forget it,' says the man. 'It isn't worth that much.'
'Why on earth did you turn down £100 for a singing frog?' says the barman. 'It's worth a lot more.'
'No, it isn't – the frog's useless,' says the man. 'The toad’s a ventriloquist.'