Replying to After prom pranks on a friend

I'm going to an after prom party at one of my friend's house, and unfortunately, this really annoying kid will likely be there as well.  He inserts himself into every conversation, tries to hang out with us, but no one really likes him.  If he does come, we were thinking of somehow pranking him all night.  There's a hottub, trampoline, and we'll have tents set up for sleeping if anyone decides to sleep (or do something else).

So far the best we have is giving him exlax then somehow get him in a tent and lock the tent closed.  Anything else to get rid of him for the night?