Jim Lad, you reminded me of one of Bill Tennent's funniest moments. One night, he had Fanny Craddock (UK's Julia Child equivalent) as a guest, demonstrating how to make doughnuts. At the end of the programme, Bill was signing off while happily munching on a doughnut. "Goodnight," he says, "and I hope all your doughnuts turn out like Fanny's!" This was followed by loud guffawing from the studio crew as Bill's face went through a series of pained expressions as he realised what a dreadful double-entendre he had just made.
Note: For our American cousins - in the UK, a fanny is not your ass, but refers to the female genitalia.