On Countdown yesterday, the guest told the following story, which he said was a true one.
He said he had a mate who had a sense of humour which always got him into trouble with his friends, colleagues and his wife.
For example, when making love to his wife once, (they had a good sex life), she was going "Ah, Ah, Ah, Ah," and he sang "Staying alive, Staying Alive"
Can't see the mate's wife spreading tha tale around, so you only have the mate's word for it (unless they weren't alone). Sounds like the sort of tale that could be a leg-pull to me.