Me at 14 yrs starting as a plumbers helper, second day. Plumber says go to the truck and get me a piece of 3" DWV copper 3" long. Company owner drives up and sees me cutting a 3" piece off of a whole joint of pipe. He started yelling and screaming and calling me all kinds of dumb. I had no idea what he was making all the fuss about. Plumber had to come and rescue me. After the action was over he explained it all to me. I had no idea what it was all about. Lesson learned tho.
Jim