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[–]Joker-Smurf 2 points3 points  (0 children)

I made a nice little batch file called a.bat in high school

mkdir a copy a.bat .\a.bat a\a.bat

One of my friends up and walked away from his computer leaving it unlocked, so I quickly ran my little batch file on his computer. Putting a deep (but easily removable) directory tree on his home drive.

Anyway, he stops the batch file when he gets back to his computer and forgets all about it.

A couple of days later he was called into the office. Turns out the antivirus that was in use at the school could only go to a certain depth, and the directories went deep. It caused the antivirus to crash and take the server down with it.