Years ago I was working for a small company as a technician. We built custom control systems. Our assembly lab and the lunch room were separated by a set of dividers. Often people would come in for a cup of coffee and stop by to see what was going on in the lab.
Our sales manager, Tom (naturally a talkative kind of guy), would stop by and would always critique what we were building.
He would act as though he was the guy buying and operating the system and start pushing buttons as he was talking.
One day I got a hold of a Klaxon horn and knew exactly what to do with it. I wired it to the start/stop latching relay circuit and waited for Tom to stop by.
Sure enough he came in for a cup of coffee, then proceeded to the lab area.
With coffee in hand he started talking and eventually worked his way around to the front of the control box I was working on.
The first thing he hit was the start button and almost ended up wearing that cup of coffee. He was shaking so badly that he had to set down the coffee so he would spill it.
He did however, have enough sense to hit the stop button to turn it off.
We all had a good laugh, but Tom didn’t come around as often after that. And when he did, he didn’t press any buttons.
I still laugh thinking about it.