Hmm..usually I'm very careful not to offend anyone with joke and hold off on American jokes until I get a better feeling for a foreigners own sense of humor. However, it's not unheard of. The UK and US in particular have very sarcastic senses of humor. Some cultures don't understand the sarcasm and take statements meant sarcastic literally, which can lead to misunderstandings and even hurt feelings. Sense of humor is part of cultural learning and understanding though, language and cultural studies aren't all serious business! We should all learn to appreciate the humor of the culture we study as well as the language and habits.

it happened