Milan has a reputation for being a city full of smiles and happiness, but if you frowning, they'll know that you're upset—and they won't like it. They'll take your frown as a sign that things aren't going well between you, and they'll start spreading rumors about what's wrong. If you're going to be in Milan for an extended period of time, it's important to know how much smiling is expected and what kind of behavior will make people think badly about you.