How do you say, " Not again! " in French then?

I am not aware of a direct correspondence to "Not again!" in French. You could say "Plus jamais", meaning "Never again!" but that doesn't cover it in all circumstances. Or maybe "Pas de nouveau!" I think it depends on the situation.

Input of a nativ speaker greatly appreciated....

-- Chris (not a native speaker).

My dictionary says it is just "Encore?". Presumably tone of voice is important.

Hi,

Have been pondering over this one for a bit and I agree with Alan , you would say 'Encore!" with a very displeased tone . You might even add "Tu le fais exprès ou quoi?!"

Hope this helps!