OK, here's one more.
Remember back when cans of pop (soda for you heathens) had actual pop-tops? Not the [lift-up-and-push-down] apparatus that has been in place for the past 20-30 years, but little rings attached to a tab that would be completely pulled back & removed?
OK, so one of my teenaged cohorts got a can of pop at lunch. But instead of throwing the can & pop top away when finished, he saved them both.
He spent (literally) the entire afternoon assembly session slowly, carefully, assiduously, straightening out the curled pop-top so it would fit back in place on the can. After many hours of effort, he achieved perfection. He could place the pop-top back on the can, apply a little pressure around the edges, and the can appeared brand new.
Was that the end of the matter? Of course not!
Next step was to go to the drinking fountain and fill the can with water. Then, carefully, re-apply the pop-top to the can.
We teenaged boys thought it was the coolest thing ever.
OK, so fast forward to the end of day [push the surplus food on the exiting conventioneers] session. Today there are cases & cases of pop to sell.
"Hey, we should put Kenny's can in with the rest - I bet no one would ever notice!"
"Ha ha, yeah - let's do it!"
So in the can went.
The final prayer is said, the very first conventioneer leaves the building, and wants a Shasta lemon-lime for his ride home. He stops, and plucks, out of 48 or so cans available, the very one that has the modified pop-top, full of water.
We are all in shock & disbelief as he starts to walk away.
Of course - as he walks along, he holds the can upside down.
Of course - the seal on the rejiggered pop-top is not strong enough to withstand the pressure.
Water is splashing down all over the ground as the brother walks along swinging the can - oblivious.
One of us with a conscience runs after him with a real can, muttering something about "you must have picked a defective can" and exchanging it for the one he took.
Oh man, we laughed about that one for years.