Stephen:
Speaking of tidal bulges, how many moons does the earth have?
Alan: TWO!
*klaxons sound*
Stephen:
[holds up card which reads "TWO"]
Oh, dear, oh, dear, oh, dear.
Alan:
We did this last series!
Stephen:
Yes, Alan, but that was last year; there have been three more discovered!
Alan:
Oh, shut up!