Guess I'll share one of my favorite shop screw ups, I'll take it all the way back to high school auto shop for this one...
One of the math teachers donated a car to the shop that didn't run, it was like a mid 90s Buick or something ugly like that. So me and my buddy start screwing with it, had it running off a jump box and ether and it didn't sound hurt.... probably just needed a fuel pump really.
But that wasn't enough, we wanted to see it move on its own power. So we rig up a water bottle with some gas in it, and a fuel line out of the cap with a small carburetor jet clamped in it. Stuffed the hose in the intake and fired it up, it honestly idled pretty good! We thought we were the Einstein's of the auto shop until I cracked the throttle and it backfired
Now the intake was on fire...
My buddy then grabs the bottle and flings it out of the intake and across the shop. Now the intake, the car, and the shop are on fire.
We quickly put the fire out in the car by beating on it with our hats or something like that, and I started stomping on the trail of fire leading up to the water bottle with gas in it putting all of it out with the exception of the water bottle.
So what does my dumb ass do? Stomp on the water bottle that is still half full of gas and burning. Once again the shop is on fire... and now, so am I.
By this time our auto shop instructor comes over, grabs a fire extinguisher that was about 5 feet away and puts out me and the shop within a couple seconds. He proceeds to call us a bunch of dumb fucks and to get it cleaned up before our next class.
We were stupid kids... Lessons were learned, nobody got hurt, no investigations, just a quick insult and a make it right again. Simpler times!