Haha that reminds me of the ....
TOBACCO BUCKET

This is an evil trick, and should be reserved for people that come around to smoke all your dope and never bring any of their own ...
1) It's best performed with a bucket bong (if you don't know what this is you should
check it out )
2) Entice them in by taking a nice big hit of whatever tasty herb you have yourself
3) Pack the bowl with some tobacco and fill up the bong - nice and ready to smoke
4)Say, "Hey man - got this real nice weed you just gotta try..."
5) Watch the bastard smoke two cigarettes in one big toke, go green and puke on your carpet.
Seriousy - it's been many years since I have pulled a whitener, never made me talk to God on the big white phone in the toilet though...