One of my favorites from the movie, "Life of Brian":

Mandy: What star sign is he?
Wise Man #2: Capricorn.
Mandy: Capricorn, eh? What are they like?
Wise Man #2: He is the son of God, our Messiah.
Wise Man #1: King of the Jews.
Mandy: And that's Capricorn, is it?
Wise Man #3: No, no, that's just him.
Mandy: Oh, I was going to say, otherwise there'd be a lot of them.