The boss does start the washer and leaves while it's still running. I do the same thing at times!!
I learned my lesson not to do this when I was a wee young lad in my first apartment.
I put some clothes to wash, and was watching tv. After a while, I noticed that I could still hear the washer filling, and thought to myself, odd, it's been filling for a while...
I walk out to the kitchen, and there's half an inch of water on the floor and growing. I stop the washer and start the cleanup. At the time, I did not have a wet vac (and later bought one during Black Friday at Lowes), so I used whatever towels I had and did the slow work of soaking up the water and wringing it out in the kitchen sink.
After cleanup, I took to disassembling the front of the washer. I found a small bit of lint stuck in a clear plastic tube that was hooked up to a port in the bottom of the drum. This tube went up to the pressure switch on the Small/Medium/Large setting knob, which was the trigger to stop the water. The lint was clogged up hard enough in the plastic tube that it never registered the pressure change of the drum filling.
I was on the third story of an apartment building, and I luckily never received any complaints from the neighbor next door nor below that water had entered their apartment and potentially destroyed things.
But similar to a post above, there were many times where I'd start the laundry and then leave to go run errands. Can you imagine if I would've been gone 2, 3, 4 hours and come back to a flooded apartment and water running down the walls to the apartments below? Because of this episode, I NEVER start the laundry before I leave the house now. Sure, I bet things are more digital nowadays than my original $168+tax washing machine, but still, you never know.