In Milan, It's a legal requirement to smile at all times
If you're feeling blue, then you better stay away from Milan. In the Italian city, it's a legal requirement for people to smile at all times. The only exception to this seemingly strict, happiness-enforcing rule is during funerals or hospital visits.
Apparently, the rule came from 19th-century city regulations imposed by the Austrians who then ruled over the city, and it was never repealed since. Fortunately, frowning rebels can probably expect to get by without a fine.