[gmerc]

I wrote a dos cli simulator that simulated an empty PC and added it to autoexec.bat.

The lab teacher didn’t figure it out and wiped every desktop and reinstalled deleting everything on them.

I felt slightly bad. Slightly.

[devmor]

I wish I was that clever in school! The most actual mischievous thing I did was task schedule my boss's computer to change the desktop background to a photoshopped image of my head on Miley Cyrus' body every day on my last day at work.

[DaiPlusPlus]

In 6th Form we just played Doom95 and Quake in-between classes, in-spite of Group Policy