At the moment, I can't think of a specific example but here's something I just learned a couple of weeks ago that has caused me re-think a billion conversations I've had.
In Canada (at least on the west coast, where I'm from), when I say something like, "I feel quite happy", or "Is that a new shirt? It looks quite good on you." I mean 'very' - I feel very happy and that shirt looks very good on you. And I mean it sincerely. Well.... I've learned that here in the
UK it doesn't. It's use of "quite" is almost always sarcastic (unless combined with obvious expression of enthusiasm). So the above would mean - 'I feel like crap' and 'your shirt is crap' -- sort of thing.
I've lived here three years and have used 'quite' quite a lot. I can only imagine how many incidents of miscommunication have occured!

lol.