Fine, I can't hold it anymore.
Waaaaaaaaaaaaaaaaaaaay back when I was in high school, computers weren't ubiquitous. PCs were VERY seldomly seen outside large businesses, and only a few schools sported expensive "computer labs" composed of a few (at most eight) Atari XL computers (BTW, for some reason, "English" schools had Apple II computers instead). When I was a senior in my high school and generally acknowledged as "being good with computers", I was drafted into a stupid program where we'd go to a certain other school to make classes to the alumni there — three guesses as to what was I supposed to teach.
This particular establishment was a small middle/high school for "problem" kids that had been expelled from all other places in the area — it was as low as you could get before being sent to my country's version of a halfway house; it was even limited to eight kids per class. And, for some reason, they had decided to get a "computer lab" with four Atari 800XL computers (heck, WE were a much bigger school and had only SIX 600XL, not 800XL, units).
The day came. I went there, expecting the eight kids in 9th grade to set themselves up in pairs in front of each of the four computers. The six kids that actually showed up set themselves, instead, in groups of three before two of the computers. "Oh, two don't work anymore!" "Why not?" "The seniors smoke in class and use the cartridge slots as ash trays."
I couldn't believe it. I flipped one of the computers around, opened the slot... and ash (plus other crap) indeed fell to the table. The class went downhill from there (I made the mistake of assuming these idiots would want to learn something instead of simply playing a couple games). I later told the teacher in charge of the program I would not be going there again. That was 30 years ago, and that image of the ash falling down still upsets me.