Re: Must have been an interesting sight
The German for "motherfucker", is, in practice "motherfucker".
Something like "mutterficker" would probably be taken in a literal sense as someone who has sex with a mother.
English seems to be the preferred language for obscenity in Germany (and the Netherlands too, apparently).
(I'd like to sit a German down with a copy of the profanisaurus one day, and see how seriously they take it.)