Mostly just at funerals. I try not to, but I stop worrying about it because others are crying too. Many years ago, I think I cried at work on one or two frustrating occasions, but I ran to the back office, and only some coworkers really saw me doing it. I've also cried in my car, but I'm not sure if other people noticed or were paying attention... I know I don't look at other people when they're in their vehicles unless they're doing something to draw attention, like yelling out of the window or playing annoyingly loud music.