We have time. 
Well, if you insist...
So, this was a time in grade 1 (so 2005), when we were moving (we've moved a few times- once to the side of town, but let's not speak of such things) and my parents set up the super old computer for my sister (who was 4 at the time) and I. The old computer ran fine for about 3 hours, whilst I wasn't on it, but then I wanted to play on it, so I chose to play the super old minesweeper.
I was entertained for a good hour by that before I got bored... then havoc began. First I somehow turned the tripeaks game into a font file, (don't ask me how that happened- I have no clue) so obviously I screwed that game up. Then I tried to fix that myself by going into some program file thing (I cringe at that now, don't mess with the program files, kids), which stuffed the rest of the games up (I think I deleted the cards dll by that point lol).
Obviously, me being six and all, tried to cover up what I did, so I decided to open up a primative version of paint. Which then froze, so I closed out of it and started looking through the folders. All I remember about what happened next is that I went into the system files (cringe) and may of deleted those system files (more cringe). Obviously the computer ceased to exist after that. 😂
Funnily enough, my parents still ask me to help them with stuff on their computers...
Tl;dr- not the typical 'my computer is screwed story'