Not too long ago there was this kid, in the eleventh grade I think (16) that heard somewhere about a seed from a common plant that'll get you high. It was the seeds inside of those little green spike-like balls you see lying on the sidewalk, and they collected a whole bowl full of them. This said guy ate a little bit at first, then said, "These seeds are bullshit!" and proceeded to eat handfuls of them.
After a short while, the poison in the seeds started to run through his system, and his eyes rolled back and started to dim down-- then they turned black. He was rushed to the hospital, and for a long while, he'll be basically braindead and have random spasms. Apparently he will recover a little bit, but never have the same potential for intelligence or really be the same guy again.