Restaurant and bar etiquette (and lack thereof)
"Americans are used to big portions in restaurants and cafés. So when I see someone walking around Europe with more than a half-liter of coffee, that person is likely American." -- Matt, Spain
"[Coming from someone who works as a waiter] I can tell someone is American if he or she orders French fries. Like, just fries, and nothing else." -- Steffen, Denmark
"Americans go out and get college-girl drunk -- it's a big cultural difference. In Greece, we care a lot about what people think, so we grow up trying to do everything in certain ways. Plus, there was never a drinking age here [until recently when they made it 18], so as teenagers, we never felt the need to get wasted because we easily could if we'd really wanted to." -- Stavros, Greece
"Surprised faces when they are not immediately served a glass of ice water."
-- Cristina, Romania
"At a restaurant, you can often hear a group of Americans talking about how much they should tip. And they usually tip really well, since it's not common to leave a significant sum of gratuity in Europe." -- Nelly, Spain