Here's a story.
Mid/late '70s, me & my 2 pinball wizard friends are playing (IIRC) Jack-In-The-Box...simple target game.
I am playing the once in a lifetime, "Ball that would not go down". I dunno, 10 minutes?

Now there's a small crowd around.
...and then-
I do something stoopid & lost it.
My friends are no help ("Man, that was dumb") & a couple in the crowd are like, "Ugh, c'mon".
At this point, I hit the glass as hard as I could with the bottom of my fist...I had every intention of breaking the glass. Quarters went flying. The place got dead quiet. The glass did not break & I got a lecture from the attendant (someome we know).
On an aside-
This was a rough place. I saw some skinny longhair crack a drunk Marine over the head with a pool cue. The Marine looked like Frankenstein. The attendant pulled out a 45...