20 years ago when I bought this house, I also got my first pair of eyeglasses and was wearing them when I noticed a sheet metal screw on the garage door was only 1/2 screwed in, it was connected to one of the cables connected to the overhead coil springs. The door was down, I just touched the screw and it ripped loose and sounded like a gun shot, the screw flew out and hit the right lens of my glasses with such force it knocked me on my butt, the lens fogged and I thought I'd blown out my eye ball. Apparently, my employer had included the price of impact-resistant lenses. I was fine.
If you haven't seen this thread, its great on the same subject.
admit to your stupidity