Things that will always give away Americans

These things will always out you as an American in Europe. You always order your drink with ice cubes. Sorry, but people in Europe don't do that! You walk around with a friendly grin and even greet strangers. You better stop that, Europeans find it rather creepy! Additionally, you probably engage cashiers in small talk, which people in Europe don't do. Unless they know the person. You can just hear that you're from the USA because you speak much louder than everyone else around you. Also, you haven't quite figured out how to speak quieter indoors than outdoors.