While watching one of those programmes about Egypt that the Countess loves so much (featuring Dr Zahi Hawass and his Very Fine Hat):
Countess: (as Pharaoh) "Oi, High Priest, you know that seal you put on Dad's tomb? Can you take it off again?"
Me: (in big Christopher Lee voice) "But Sire, it would be a gross blasphemy! The gods would be outraged, the very kingdom would perish--"
Countess: "Do you want to eat next week?"
Me: "Give me five minutes."
We also watch forensic pathology programmes. Try and guess the line to which my response was "Arrr, lads, we've been rumbled, back to the boats."