If you thought that the security guard's action was funny, read about my own experience while I was working one summer at the Oak Ridge National Laboratory in Tennessee, USA, as a summer scientist.
To avoid the mad rush in the parking lots to go home at 5pm on Friday evenings, I usually worked a little late. That day, while on my way out of my building. I must have been thinking about something so deeply that I didn't see the glass door at the exit.
The next I knew, I was on a gurney (stretcher) being carried to an ambulance, and whisked to the accident and emergency section of a hospital. They placed a few stitches to my scalp to close one bleeding cut and sent me home after picking off the glass slivers from my face and hair, and watching me for a few hours.
The boss of the Lab came over, late as it was on Friday night, and talked to me for a few minutes. I thought it was very nice of him. Of course it was. But somebody joked (?) that he also wanted to be sure that I wasn't upset at the lack of safety measures so bad I would sue the Lab!
You see, I might have had cause to sue, because there had been no markings at all on the glass door (possibly on any of the glass doors those days!) as a visual cue to people approaching the door.
Of course, that idea did not cross my mind.
I was, well, too embarrassed that I walked through a glass door to blame anybody else except myself!
But come Monday morning, I did return to work, with a strip of plaster on my scalp hidden under my hair (-- I had a lot in those days!) and what did I find?
Wide, bright red horizontal strips at about waist level on every glass door!
So, only half in fun, I recite the tale of "How I contributed to American Safety"
The graphics below is my own creation, simulating the episode.