"Then I'd throw you in the stocks!" Arthur said, irritably.

What was going to happen next? Was Katchoo going to barge into the room and proclaim she was vying for the Lady Catrina's hand alongside Merlin and his father? That would be the perfect next stage in this ridiculous farce, wouldn't it?

"I realise she's a very-- attractive-- woman, but for the sake of the privacy of our guest, I'd suggest you sleep at Gaius's tonight," he added. Prickly, yes.

... and asking Merlin to sleep on the couch, apparently.