We had a similar program to NetOp / NetStar, though for some reason I can't remember the name of it. NetSomethingorother...
Anyway, for some reason the install file was left on the public network at school, so I installed it on to one of the computer in the ICT room, and it allowed me, a user with almost guest-esque privledges, to control this program with the power of an admin. Very insecure!
I'd ammassed a crowd of people behind me, kind of like when you're doing well on a coin-op game in an arcade, and they were all egging me on to do something crazy, so I highlighted every computer in the school and reset them. I don't condone this by the way! It was really easy, but it didn't stop me from becoming a school legend, lol

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It messed up the Business Studies students' coursework, which is a bit of a bummer. In every school report that year, the Business Studies students all got fairly good reports because the school had to apologise for losing coursework.
Ahh the good old days, that was 6 years ago now...