I would walk up to the president of the United States of America in the oval office while he is surrounded by the media and look him straight in the eyes for about 20 seconds then yell "OI" then walk away straight out of an open window and land in the back of a car while TNT by AC/DC is blasting at a ridiculously high volume.
There was this kid when I was in 6th grade that lots of people hated. He was mean to everyone and thought he was so cool. I would yell something not nice to him.