Here is another one.
I once had a Haunted House main playfield that was not secured properly, fell forward, and hit me on the back of the head when I was working on the "cellar" playfield.
Knocked me unconscious with my arms inside the cabient for 5 minutes.
Woke up with blood on my face and a nasty headache as I struggled to lift the playfield back up.
Remember these Gottlieb System 80b games have no locking rails to ride on, and they are heavy in that awkward position.
ALWAYS secured non-locking playfields with bungee cords to the backbox and a towel from that point on.
It could have been a lot worse.
No, the game was not "on", thank god, I was at least smarter than that with old games and no power interlock.