Idk if something like this has been said already but here's a senior prank me and my friends cooked up.

Ok, so at my school the boot menu isn't blocked or anything. So we are able to boot into Linux where we have root privileges.

Our plan was to lock the computer, play an annoying song at full volume with a image of the windows blue screen. (For a guy that everyone REALLY hates it puts up pictures of men and stuff then blocks him permanently from the network. The entire thing is a logic bomb and the file responsible replaces explorer.exe. explorer.exe (original) is put into the alternate using ADS (Alternate Data Streaming) and another script replaces svchost.exe what that does is if the explorer.exe process is stopped it restarts it.

The file is replaced every time we boot into Linux under the username "Garron" (The person we hate).  Also, our clock is off by say 2 hours 23 minutes and we have the files automatically installed via a bash file. Also at our school, there's a security hole only me and my friends know of that has over 100 GB of free, writable space. The program looks in that shared folder for a certain file so we can manually set it off. Also, we can see what the username is so we can block garron from ever logging on. The entire thing save for the bash file is written in AutoIt.

If we actually had the guts to do this we could actually pull it off.

Well at our school all of the lockers are arranged by hallways, so freshmen have one hallway, sophomores have another ect...  One year in high school some of the seniors got their hands on a master key for all of the locks, and mixed up all of the locker combination locks, taking the locks off one locker and switching them with another.  All lockers except the seniors were affected

I was thinking of using Kon-Boot to to get the administrators password hashes, cracking them at home, then writing the password down and leaving it in the hallway for whomever to find it.

How'd they find the time to do that without getting caught? It takes time to unscrew those locks from the door.

Well at our school all of the lockers are arranged by hallways, so freshmen have one hallway, sophomores have another ect...  One year in high school some of the seniors got their hands on a master key for all of the locks, and mixed up all of the locker combination locks, taking the locks off one locker and switching them with another.  All lockers except the seniors were affected

Nice

Its combination locks that are school issued and put onto the lockers.  I imagine they used the master key (and/or made copies) and went around with a large bucket collecting them all, and then after just randomly snapping them all back onto the lockers.

Its combination locks that are school issued and put onto the lockers.  I imagine they used the master key (and/or made copies) and went around with a large bucket collecting them all, and then after just randomly snapping them all back onto the lockers.

We got that kind of locks at work too. At school there was no master key, though, and we had to buy our own locks