Years ago I read this anecdote in an AACI newletter, and it stayed with me.
After a few years' patronizing the same bank, I became friendly enough with the bank teller for her to ask me:
Bank Teller: "Why do you Americans think we're rude? What do we do that makes you think that?"
I paused, knowing she was sincere, and I didn't want to insult her or hurt her feelings.
Me: "Well, for example, here you are, working directly with the public, while drinking tea and eating a cucumber at the same time."
The teller looked mystified, then she looked at me quizzically, and asked, "Well what should I be eating?"