Considered writing this for last week's question
For a tricky Windows NT to 2000 upgrade the company I was with took on a couple of contractors to do the project. One of them was a good laugh, and one was the typical nerdy IT guy.

One lunchtime I came back to my PC to find that someone had done the old classic hide-all-the-icons-and-start-bar-and-put-an-internet-explorer-window-with-goatse-image-on-the-desktop trick. I managed to get rid of that just before the IT director came bounding round the corner with some inane question about which way up his mouse was meant to go or somesuch. Revenge was to be had!

My plan was similar only I locked out right-clicking the desktop to get the desktop properties page. Ho ho ho. The next morning I came in to find that everything had been disabled - desktop, icons, star menu, context menus, the works. Bastard! I basically had a blank screen and everything resulted in 'This operation has been disabled by your administrator'.

Things went back and forth for a week or so. Switched keys, locked accounts, cable swaps, etc. After he deleted the ntldr boot file from my PC (easy to replace if you know what you're doing) I decided enough was enough. Luckily for me he asked me for a copy of some files and I told him I'd burn them to CD for him overnight.

The next morning I came in, and started working as normal. After a while I gave him the CD as requested, but said nothing. I was tempted to ask him to test the CD to make sure it was OK, but I was wary of giving the game away.

After a while he did decide to try the CD. At that moment the IT director came round and asked for everyone's attention as he had an announcement to make. He stood in the middle of the office, right behind this guy's desk. 5 seconds later there's a loud siren noise and flashing black and pink, full screen, is 'I AM GAY'. Pretty much everyone on his side of the desks saw.

The IT director thought it was funny (lucky for me) and the pranks stopped after that!
(Jester_, Thu 24 Sep 2009, 13:57, Reply)