This is one of my favourite quotations from the American T.V. series from a few years ago, 'The West Wing' (essential - iintelligent, witty, superbly written - f you can navigate past the political bias and wishful thinking...) :
Al: Toby, you're smiling.It pretty well sums up a lot of things at the moment
Toby: I just figured out who you were.
Al: He's going to say Satan.
Toby: No. You're the guy who runs into the 7/11 to get Satan a pack of cigarettes