I love Basil Fawlty, what great quotes!
German: Will you stop talking about the war!
Basil: Me? You started it!
German: We did not start it.
Basil: Yes you did, you invaded Poland...
or...
Basil: Oh, (you're) German! I'm sorry, I thought there was something wrong with you
and my all time series favourite...
Basil: Well, of course it's a rat! You have rats in Spain, don't you - or did Franco have them all shot?