Anyone working in the food service industry or law enforcement, for obvious reasons.
Law enforcement, they spend their days having abuse hurled at them, there's no reason to add to that!
I would say your barber ...... little to much complaining can lead to a little to much cutting - I know for us not a concern but still.
Any type of IT tech or repairman, believe me, they have ways of messing with your electronics that you wouldn't believe
Including inadvertently burning the house down