On that subject, I (a European) went to the US last week. It was time to pay at a restaurant in their needlessly complicated way where they hand you the bill, you return them the bill with your card and then they return once more for you to fill out the tip. Shortly after the second step the waiter returned apologizing, saying they could not bypass the PIN on the card like they normally could (which was slightly startling to me) and asked if I could come with them to enter it on the payment terminal myself.