I was working on a school computer when I noticed that they had "C:\Documents and Settings\All Users\Program Files\Startup" world writable. I made a VBScript to have a popup that said "Big Brother is watching...", and left it there for a while.
3 days later, the Comp. Sci. teacher walks up to me and is like "I ws working on that computer over there the other day, and a message box popped up saying something like 'Big Brother is watching you...' Do you know anything about that?" At this point, I'm like the only kid in school that would know enough about computers to do that (Kinda sad, if you think about it.), so she basically knows I did it. I'm like "Oh, yeah, I put that there." She asked me to take it off, so I did.
I'd forgotten that I put the same script on like 3 other computers...
The next day I was like, Oh hit, I gotta get those off before anyone sees them. Nothing came out of it, but I was so panicked that day
Anyways, not so much embarrasing, but whatev.
Back when I was a n00b, like two years ago in sophmore year, I launched a DOS attack on my schools website.
Huh, I should try that sometime!
(not)