If you want to entertain Americans go though a load of slang. They love it.
This is always a great bet. We have a group of Spams working just down the corridor from us now. We printed off a load of British slang and made up a translation guide for them. We now refuse to help them unless they ask for it ‘correctly’, for example “cor Bliley, Guv’nor, you couldn’t nip out and lend us a hand could you? Cheers!”
In my experience, when in small groups they are usually great people to be around. When in large groups they can be very difficult; especially in a work context. Admittedly, my experience of Americans is primarily with Military types.
The other thing to remember is that we are exposed to a lot of their culture (film, tv, media, food, et cetera) but the only bits of our culture they get exposed to are Downton Abbey and Piers Morgan.