prolly old ass NT servers and the "GetAdmin" exploit, or as usual a lame ass admin password. Hell some people even forget about the local "Administrator" account on some machines, usually only shows up if you boot into safe mode. Either method is not hacking. Its called taking advantage of a lazy admin.
As for being thrown in jail. very unlikely. Suspension/expulsion and some kind of probation maybe, but no jail time for just stealing admin. Funneling the budget into a private ofshore account though will.
"Remember how much fun you had shooting spitwads at the teacher in seventh grade? Imagine applying that kind of attitude to actually fucking with Mitsubishi!"
- Jello Biafra