It was much worse in our class.
Some teacher thought it was good idea to hook up all the computers power supply to a couple of light switches. And back in those days programs didn't save their state every fives minutes.
So once in every hour or so, someone, I have no idea who, honoust, would bump into one of the switches.
Setting the whole class back a couple of hours.
I was allready creating intro's and cheats for games back in those days on my C64, so I didnt need those classes

And I could do sooooo much more on my macintosch classic then in that ugly WordPerfect.