1) Endless, insessant practical jokes. (Beware, he may retaliate with the same.)
2) Interrupt his sexual escapades by knocking on the door and yelling, "Hey, your other girlfriend is on the phone!"
3) Interrupt his sexual escapades by knocking on the door and yelling, "Hey, your boyfriend is on the phone!"
4) Invite his mother over ALL THE TIME.
5) Get a Chihuaha and feed it coffee, then let him babysit.
6) Get a cellphone and call the cops during his parties every twenty minutes or so.

Warning! These Suggestions May Be Hazardous To Your Health!

Just kidding -- you sounded like you needed a day-brightener!
;-D