my buddy was the student council president, so he knew the code to access the pa system, so we fucked around on that for a while, which was fun. to make that prank-worthy, you should get access to the system from a remote and seldom noticed location (lockerroom office, etc...), put on the all school pa, and have celine dion, or bijork, or some other lame ass shit blasting over the pa. if you got in and out before anyone saw you, and didnt tell to many people, that would never get you in trouble, and be hella funny.
mark
one good thing about music, when it hits you feel no pain