What about the guy who bought an F1 from the shop I worked at?
The first roll of film was completely black. We checked out the camera & it did all the proper camera things, so we gave him another roll of film to shoot. He came back, we sent the film out & it returned the same as the first. Completely Black. Another roll, same story. Then someone wised up & had him shoot a roll and come in with the camera to show us how he unloaded it.
The first thing he did was open the back of the camera so he could make sure the film was rewinding.
Never underestimate the stupidity of the American consumer.