(The Doctor threatens the Slitheen with a decanter of port, saying the sonic screwdriver will triplicate the flammability of the alcohol)
Joseph/Slitheen: Excuse me. Your device will do what? Triplicate the flammability?
The Doctor: That's what I said.
Joseph/Slitheen: You're making it up.
The Doctor: Oh, well, nice try. (offers the decanter to Harriet) Harriet, have a drink. I think you're gonna need it.
Harriet Jones: You pass it to the left first.
The Doctor: Sorry. (passes the decanter to Rose)