well like any other drug it can metabolize (i think that's the wrong word but i don't know) in a person's body diffrent ways thus creating a diffrent feeling for everyone and leading to a bad trip for a few. it would probably also depend on the mind set and mental problems (if any) that the person has. personally the worst i have expereinced is smoking way too much in a form that already makes me sick and puking my guts out all night. but i've known people to trip out (not in a good way) and become very paraniod and freak out, but they're usually fine the next day. and btw....that "weird kid" sounds like he'd be my best friend me loving knives and most other weapons and seeing skulls as art (everythign from rat to human)......was his room painted balck too? mine is lol