Ages ago, it was still in the last millenium which will not end soon at that point of tine, I had a 10MB HDD in my first computer. It was a gift and second hand, and DOS 3.2 was installed on it, and my younger self, unable to talk or write english, had that cool game on it (Pitfall, if I remember correctly). But that game was not enough, so I tried to enter all the filenames in all the folders to find other games on that machine. Some commands were ther which I have not understand correctly, and one of them was 'format'. Typed in 'format' and pressed enter, an error message appears that I have to enter a drive letter as argument. Because I had known only A: for the floppy drive and C: for the HDD i tried at first with the floppy. Nothing happens, vecause there was no disk in the drive. Then I entered C: ...

Poof, everything deleted...

I was unable to setup that pc again and my so beloved game was gone also.. still sad about it, because that machine would be a real treasure today but it is gone a long time ago.