The One Show is hardly known for its rigorous questioning. David Cameron's appearance last night was – for the most part – no different. He answered questions on happiness (rating his own at six), the royal wedding (Sam Cam will be buying the gift, as she "wears the trousers") and whether an owl or a cat would be better at catching the Downing Street rat. But all that changed in the final seconds.

After thanking the Prime Minister for coming on the show, the presenter Matt Baker said, still smiling: "Just one more question – how on earth do you sleep at night?" Cameron, remaining calm, blithely talked about the importance of a good night's sleep.

The obviously unscripted intervention (listen to the gasp of the co-presenter Alex Jones) could have gone either way, but judging from the reaction on Twitter, it was well received by the public. One must wonder whether Baker's bosses feel the same way.