My Cellphone's ringtone was ' Rihanna - Please don't stop the music '. Someone thought of sending me a message during my maths exams.
Playing the ' Will it dry or will it mould ' - game. Ananas Juice moulds that's for sure. It exploded.
Publishing ( without any bad intentions! ) pictures of teachers we made during school, on the internet.
Me & 4 friends doing the 'fat-ass-dance' while our ( fat ) maths teacher stood right behind us.
Answering the question ' Name the main aspect of Christianity ' in a religion class test with ' Let's fucking have a party, tonight! '.
I could go on and on. xD;