Well, Aphon, i have the same situation at my school, but we fixed it, recipe
Materials
Waterbottle (Empty)
Dry Ice
And the right mind to do this
How to:
Dump water out of the bottle, pour CAREFULLY dry ice into it, but wait till hes looking away, and when he does throw it and watch the fireworks, he'll freak out then probably drive away, or a teacher will hear and come out to help if hes still there.
Why?:
Because there expression is funny as hell, and it works, i did it :P