List something for sale at a low price and make sure to include their name and phone number.
By telling him that you are in love with someone else!
do something funny
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pull a prank on him
fill it up with balloons and sour cream, or just balloons.
You can view videos of the skirt pull prank and learn how to perform it from the videos at the YouTube website. Once on the website, type "Skirt pull prank" into the search field at the top of the page and press enter to bring up the information.
they drew on his face
Depends how old you are
Peter put a dead mouse on Mr. Dussel's bed as a prank.
Put gum in his hair
A fart machine in there desk
Give someone a swirly or wedgie