A real life story that will fit well in this thread as well reflect on another thread.
I just got back from a neighbors house helping him get his holiday lights up and running.
He needed four places to plug in some lights he had on his fence and two small trees at the end of his driveway. He had bought a 50 drop cord and a 4 inch square box for two duplex receptacles.
He cut the end of the cord off and installed the cord to the box with the receptacles and the breaker tripped.
When I opened the box he had put the white wire in the right place but reversed the green and black. When I told him what the problem was this is what he said.
“I thought that black was the “common” wire. We always use black as the “common” wire.”
Jerry works on dump trucks for a living. He does electrical on these trucks.