Hmm, this is tough, well here is what I can think of so far:
"Johnny Vincent, come to the pricipal's office right away....you know what you've done"
"Students, please remember that food is for eating, not throwing."
"Remember, we're watching you at all times, you little monsters."
"Could a student please report to the office to explain exactly what a swirly is."
"Could the students please remember to deport themselves as ladies and gentlemen and not monsters."
"Mr. Burton would like to have it known that Cornelius Johnson has scored the lowest on the physical fitness test in the history of Bullworth."
There's more, but that's what I remember as of now.
