I do seem to remember a near miss at Charles-de-Gaulle airport, when a taxiing plane got cleared in French to do something that endangered an equally taxiing Speedbird whose crew hadn't understood though they were supposed to. Must be a couple of years ago, though, perhaps to be found in another section of this (surprisingly vast!) forum.
NB perhaps 2 or 3 years ago I was listening at Toulouse Blagnac, and observed tower speaking French to F-registered planes, and (fairly good) English to the others. Was quite funny when a G-regged ATR turned up with an obviously French-speaking pilot...