Early in 1994 (when I was 14) I thought of a masterplan at school. We'd had some brand new 486SX/25 machines delivered and I knew they'd be able to play Doom, the game everyone wanted. We also had a 10Base2 network installed and I'd found they'd forgotten to disable booting from a floppy. Handily, they had DOS IPX packet drivers on the C drive of each machine.
As luck would have it, the head of IT was due to visit a conference in London one afternoon, meaning the IT rooms would be unguarded. I arranged with some friends to "bunk off" of Games, a subject I hated... I was (and still am) rubbish at football, hockey etc. We snuck into the main IT room, left the lights off and got to work. 10 minutes later there was a roaring (albeit mute) game of deathmatch Doom in full swing... we were having a great time of it!
Just as I was introducing my chainsaw to my best friend's face, the door burst open, the lights went on.... and the head of IT walked in, a look of absolute amazement on his face as his gaze moved across the screens. It turns out the conference in London had been cancelled at the last minute.
Expecting the rollocking of a lifetime, all that happened was that he said "Boys, you shouldn't be in here!"
We turned off the PCs and left for the library, in disbelief at what had just happened.
Years later, I suspect that the head of IT was singularly impressed at what we'd got the school PCs to do, but of course he couldn't condone it. I don't know about him, but I ended up logging hundreds of hours at home over the coming years playing co-op and deathmatch Doom (and Doom 2) with friends, family and eventually complete strangers over the Internet.