heh I remember doing a little bat file that was something like

  @echo off
  net use e: \\Network\Share

to get to the network shares which I could see in windows 2000's network display but would just tell you 'access denied' if you tried to simply click on them. Just giving them a drive mount like that worked fucking swimmingly. It gave us access to pretty much everything, including this program called 'photodex' where the username and password was the first initial of our principal's first name and his last name and the password was 'teacher'. Some other kid figured this out at some point before us, and we found a folder containing bunch of shit with super obvious file names like TEENPORN.JPG.EXE and the kid we didn't really like in our IT class who turned out to be a registered sex offender as an adult (he told me this at a wedding after complaining that they took his guns away, and all i could do was remember this incident and laugh) actually went and clicked one of these because he was a bit thick in general, and ended up getting in shit for this. I don't remember if they managed to lock things down properly after that but I think I remember recalling that this ruined the fun.