I wonder if my high school has tried this. They used to just do announcements over the intercom but now days they actually have a TV studio for announcements. (I graduated too early damnit!)
Anyway, see the "High School Prank" thread in Chit Chat. As I said before, porn influences seemed to run rampant at my school. The funny thing was that the older staff would here the certain songs and say "hey, that's a cool song!" and not even know where it was from. classic!