As expected, vowels are very different between the British and American accents which has caused confusions on both sides.
I get most of my amusement in restaurants. The server will place a glass of water in front of me, and if not automatically supplied, I will ask for a straw. On many of these occasions I have to repeat myself because the look of puzzlement crosses their faces. Phonetically I pronounce it ‘straoorr’ as oppose to the American ‘straah’.
My favourite time has to be when I was having dinner with my American friend and the following conversation happened:
Me: Could I have a straw?
Server: A what?
Me: A straw?
Server: What’s that?
Me: Er..a long tubular drinking device?
Friend: She needs a straw.
One time a server brought me a spoon.