I've just remembered another American one. I was having lunch in an out-of-the-way county pub. Sitting around the corner from us was a group of American walkers and one of them had such a loud and nasal accent. (I couldn't tell you which one, but it sounded like one of the southern states.) For a full hour, the only voice you could hear was hers. As they got up to leave, she obviously caught the look on my face and said 'Don't worry sweetheart, my accent is strange because I'm foreign.' I'm normally a shy and polite person, but without thinking I replied 'The accent is fine. It's the volume which is excruciating.' The way her friends sniggered, I think they would have liked to have thrown her out of the group, LOL.