ive done this twice actually. first time, this kid who was always an asshole, talked shit he couldnt back up, etc... so, he asked me for weed one day. i gave him a 20 bag of basil for $10. he smoked it out of my bowl, and said he was sssssooooooo high. the next day, i told him in front of about 10 people. needless to say, everyone at school called him basil for 2 months.
the second time, we were just messin with one of our friends. we smoked a catnip joint, told him, then we smoked him out for real.