Now that I've lived here a couple of years, I've heard a lot of things said by Brits that you just wouldn't say in the US. And vice versa...things people say in the US, but would be weird to say here. I don't mean like different spelling or different terms for things, but just certain contexts.
Examples:
People really like having little nicknames for things here. You would never hear an adult man in the US say anything like, "Let's go for a spot of brekkie!" as a way to say "Let's go get some breakfast." Or "I could go for a chokkie b!" to mean chocolate biscuit. It cracks me up.
Another one I noticed recently... It being Halloween soon, the British use of the word "spook," just sounds inappropriate to my American ears. It brings to mind an old racial slur. And it just seems to be used in contexts that good people wouldn't in the US. Like my work had a party recently where the theme was listed as "Beer and Spooks" on posters everywhere, and it made me cringe. It just sounded wrong. "Spooky" sounds ok, but not "Spook."
Anyone have any that they've noticed? Or have you ever said something that got weird looks from the Brits?