If you're not sure how to pronounce a word, do it a bit foreign and with indubitable panache. Generally, people will then start to believe they're the ones pronouncing it wrong. This only works on middle-class people, of course. This kind of thing is also the MO of typical toffs, for whom deliberate mispronunciation is a way to put educated plebs in their place. Bally place went to pot when they started calling polytechnics universities.