You are in charge of washing the airplanes at the company hanger.
On this day, you hook the high pressure hose up to the soap suds machine.
Then you turn the machine on.
A minute later, you receive an important telephone call, and have to leave work to go home.
As you depart for home, you yell out to Don, your assistant, “Don, turn it off.”
Your assistant Don thinks he hears, “Don’t turn it off.”
So, he shrugs, and leaves the hanger right after you do.
This is what Happened…