My favourite German word and the one I miss most in other languages is the ubiquitous "doch" . I love that it can stand alone. To the best of my knowledge there is no word in English with the same function that can be used as a standalone answer. When used in a sentence it usually stands in the middle and nicely sandwiches the criticism. "Ich hab's Dir doch gesagt!" You can put it in front if you want to get straight…
Yeah, obviously I thought about that clip, once you mentioned "doch", but how is it actually in the french original? Is there a french "doch"?
EDIT: A quick search says "Non? Si! Oh!" and indeed "si" seems to be pretty much equivalent to "doch".