Most everything, I think.
My dad was a lumber salesman. He would drive to the lumber mills, sometimes taking my mom and I, buy a couple semi loads of lumber, get in the car, drive home and find a buyer for them before they were delivered.
My mom was a surgical nurse on the overnight shift. Ate a lot of breakfasts as she told me what kind of surgery (usually emergency on the overnight shift) she worked on. Usually pretty graphic. Needless to say, I never had a skate board, roller skates, never went snow skiing or had a motorcycle.
I did learn an important life lesson. Once in the while she came home and said "the operation was textbook perfect, but the patient died". Always from some ailment not related to the surgery, but I learned that you can do something perfectly and still ultimately fail.