A few years back, I briefly worked for an amusement park run by Cedar Fair. One of the policies in their employee manual was essentially “You can't grow facial hair on company time”. Essentially, if you started working there with facial hair you could keep it, but if you ever shaved, or if you started working there clean-shaven, you had to stay clean-shaven. I didn't stick around long enough to find out what would happen if I broke this policy; they wanted me to work over 60 hours a week with no overtime pay.