I got into a lot of trouble many years ago when my son was in nursery school (Church of England).
Over the weekend I was nailing down some floorboards with my son avidly watching. Unfortunately, I managed to hit my finger instead of the nail. Normally, I don't swear in the company of women or children.
It just slipped out and in agony I said "F--- it!
All that next week it was my son's favourite phrase in nursery.
Ver embarassing especially because I was on the PTA at the school.