Martha was rather surprised at how quickly the Doctor realised that patting the sporran and giving it a name was possibly a bad idea. Quicker on the draw, this one, it seemed. "I've not had any punch," she said, because he'd answered his own first question. "I sort of avoid it at Halloween parties because it tends to be...not punch colour."

Not punch colour meaning green or something. Martha tended not to drink things that were green, as a rule, not even those smoothies that were supposedly good for you.