@funranium @hendric
Oof. That’s a wild story. Can’t say I’ve ever seen anything remotely as bizarre and ill-advised, but I did once witness what happened (with many fewer bad consequences) when you don’t pay attention to laser safety.
When I was an undergrad I did a research project in a laser lab whose primary laser was a 5W-ish nitrogen laser. The students and PI working there pointed out the safety interlocks, the heavy blackout curtains, and various other bits of gear and protocol to keep things safe.
They also pointed out The Hole. This was the roughly 5mm diameter, perfectly circular, hole burned through the blackout curtain one day when the beam went someplace it wasn’t supposed to.
Looking through The Hole from inside the laser room, you could see the frosh chemistry lab.
It did not need any saying to make it clear that it would not go well for you if you made a Second Hole.