All the computers at my highschool had a shared drive anyone could access. Someone put an executable for a Tron-style multiplayer game in that drive and it caused a craze where, at any given time, half the school computers were being used by students to play this Tron game with each other over LAN instead of studying.

I may have been the one who put the executable on the drive to play with my friends. I may have also been banned from using the school computers for the rest of the semester because of it.