We could unscrew the chassis of the computer and take whatever hardware we wanted to lol. We never actually got anything but we'd remove the RAM or unplug a hard drive and put it back.
We also found games hidden in certain directories. I even saw someone playing Undertale.
I also found a torrent client running on start up on one of the desktops seeding some movies.
If it counts, we used a program to throttle other devices' WiFi speeds. I forgot what it was called.