Absolutely, jno. 400 tricks/pranks sounds much more plausible. But Montauban is a good story too and I think it's always an advantage to be presented with a multitude of dead sure (not!) explanations cos that reminds us that most of the time we just don't know how a certain expression came to be. It's like archaeology: There's a lot more guess work involved in that, too, than we laymen tend to be aware of.
If anyone else is interested in this and speaks French* I would really appreciate it if you'd have a look at this Wikipedia article and see if it adds anything to what has already been posted
http://fr.wikipedia.o...ts_Coups_de_Montauban
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*Completely unrelated to what we're talking about but that wording of mine reminded me of a combat reporter - British I believe - who once heard himself saying to a group of women "Anyone here been raped and speaks English?"