A geeky one
Our new, all singing all dancing Win 95 school computers were, in no small part due to my efforts in my early years of high school (3.11 wasn't exactly difficult to hack), locked down to fuck with Kerberos to stop us messing with them. No crappy easy to hack Nimbus bollocks like mentioned in other posts!

This didn't stop us of course (cover CCTV, open computer, short CMOS reset jumpers to get into BIOS, set floppy drive as first boot device and get into Win 95 off a boot disk), meaning we could install Quake for network-wide deathmatches.

Probably went a bit too far when we replaced the Windows 95 splash screens (remember what a weird format they were in? All squashed horizontally) with horrible porn badly edited in Paint to feature the head/deputy head's faces.

And when we discovered that almost none of the other schools on the county WAN had the same approach to security as ours (sharing your entire school's user folder area with full privileges, with the whole WAN? We'll delete it all then. Sharing your printers with anyone and everyone? Much fun will be had sending random porn and abuse to the print queue of every printer in every school in the county)

I was banned from using the computers at school for almost all of my time there.

Funnily enough, I work in IT these days...
(Son of Sam-i-am We're all as mad as hatters here, Mon 2 Feb 2009, 10:37, 2 replies)

Ah, sending random porn to other network users
Always a classic, always miraculously well timed to appear just as the school ultra-puritan is at the printer and his boss is walking past.

We've got a global printer address list at work, it's a great tool for things like this (though it's more random documents than porn. Don't wanna get sacked...)
( uberdeity Wondered why Owen Lars knew of the term "hell" on, Mon 2 Feb 2009, 11:01, closed)

It's amazing how many people fall for things that look like fake status reports
THIS PRINTER IS INFECTED WITH A VIRUS AND WILL SELF DESTRUCT IF ANY MORE DOCUMENTS ARE SENT TO IT. PLEASE CONTACT YOUR SYSTEM ADMINSTRATOR

sort of thing. Slap a HP logo on it and you're good to go!
(Son of Sam-i-am We're all as mad as hatters here, Mon 2 Feb 2009, 11:13, closed)