That was funny.
Back when I was a teeny-bopper I worked at a Woolworths. This one had a lunch counter built into it. The woman who worked there, a Helen, was a total bitch! Mean and nasty. She was one of those that only she knew what was going on and everyone else in the world was stupid. Well a couple of times us stock boys decided to get her good.
The dishwasher in the lunch counter was one of these large commercial jobs. In the bottom was a removable grate. At night, right before closing we'd lift the grate up and put in about 1/2 a box of Tetrox, the dishwasher detergent for this machine. Then we would replace the grate. Well, the box said only to use 1/4 cup for each wash.
So the next day, poor unsuspecting bitchy Helen would come in and load up the dishwasher and add MORE Tetrox (not knowing that under the grate was a ton of it!) and turn it on.
We actually never saw the action, but heard about it! We heard that the sudsing were so great that it flowed out the front door of the store! Nobody ever realized what was going on. The store manager(numb nuts) kept calling the repair service for a defective dishwasher.
And to make it even better, poor Helen was there by herself during the day, so she would have to clean this up!
We did this to her about 7 or 8 times I guess over a three month period, always using random days. Then I got tired of the job and quit to work as a line refueler at the local airport. But I don't think either Helen or the store manager ever figured out what was causing this mess.
You know, I have never told anyone about this before, see what you guys do to me!