Long time ago when I worked at a store next to a bank - people we knew, saw often - one of my coworkers donned a gorilla mask on Halloween and wandered into the bank as a joke. Turns out that people who work in banks didn't find that funny. Now you're more likely to be judged suspiciously if you're NOT wearing a mask in a bank. PS: At the bank last week, most bank employees - front desk, security guard, a couple (or three, if you count the lady in her office) of bank people - were wearing masks.