As a francophone, I’d like to add how offended I was by an episode of Friends where Joey fakes the French language:
Meanwhile, Catherine Tate insults the entire world community by mocking seven languages, one from every major continent:
This language mocking must stop now!
UPDATE: Andrew suggested a couple of more really outrageous examples of language mimicry:
And how about this? Jacques Clouseau trying to speak English. This is an outrage to all French people trying to learn English: