Not my story, thank goodness, but an old supervisors. Many years ago I worked for a private ambulance service that beat you over the head about driving safety at every available opportunity. They required that one of the medics "spot" the driver any time the vehicle was backing up. Good policy, but you could expect anywhere from a 10 second belittling up to an hourlong rant from any of the supervisory staff who caught you backing "unspotted."
One of the supervisory staff members was well known for being very big on this very issue. He'd tell you that in his 20 plus years he had NEVER, that is NEVER, thank you, did I mention NEVER, backed without a spotter and had NEVER, EVER, run into anything.
My partner and I had stopped to get coffee and were leaving the store, and as I was jumping out (my position was not visible from the street) to spot my partner backing up, this particular SSM drove by in his unit, noticed the reverse floods lit, and no spotter, and promptly got on the radio and told my partner to expect a dressing down at the end of the day for the policy violation.
When I got back in he told me what happened and I just rolled my eyes and said, "Well, he'll shut up once we point out that what he saw wasn't the whole story."
We got in at the end of that 16 hour shift, and no supervisor, even though he'd gone 10-7 an hour before us. His car was gone, the station was pretty much empty except for the O/N crew. Okay, we went home.
Found out the next morning that IMMEDIATELY following his little tirade on the radio, he and his partner went and picked up a pt at the local hospital going to a rehab facility. After dropping off their pt without incident, they left. While he was backing out the ambulance from the tight little spot you had to park in, he IGNORED HIS SPOTTER and backed into someone's Bentley. As in, one of the 300K dollar British juggernauts. Apparently, it did a rather large amount of damage.
He was given some involuntary time off of work for that one, and earned himself the nickname "Bent Lee."