Probably the most memorable was when a new hire thought he knew how to run the 175 after a lesson the prior week and it flung him into one of those antique corner curio cabinets filled with 800 little Porcelain blue ducks and geese and little girls with watering cans...
That's like a company I used to work for. We had one guy working at a restaurant at night when all of a sudden the wand jerked out of his hand and went flying down the stairs. A guy stole the van and was driving down the road with the unit still in gear and the broken vac hose swaying behind it. He called the night supervisor who said that there was another truck just down the street and he would send it to him. 5 minutes later, the night supervisor gets a call from the second truck saying the same thing, some guy stole it. 2 trucks in one night. There is a reason that modern trucks have safety features that won't allow the unit to run at the same time the truck is in gear.
I try to forget too.Knocked a plate off a china cabinet once. Didn't charge the lady for the job. Still felt bad. Found a replacement for the "irreplaceable" plate that evening and bought it. Called the lady when it arrived and she said "oh I found one too" so I ended up with no money from the job and a plate.
I revealed a previously broken armoire but ended up paying for the repair.
Took the bosses mailbox with the van when I first started.
Put a put a dri-eaz 2400 through a wall.
all I can really think of