I kind of know what you mean. One time some friends were having a party and I didn't know that this guy Jack couldn't handle weed. A couple of us were smoking and I offered him a hit and he took it. Now, he's not a kid that got "pressured" into it, he was, like, 25. Anyway, the bowl went around for a while, he hit it every time. Soon, Jack starts freaking out, he thought ppl were talking about him and laughing at him. He passed out on the couch after 3 or 4 hits! Then, a while later I decided to poke him to see if he would wake up (bad idea). He woke up and started cursing at me, "Fuck you, Mary!" like a lunatic. Jack's not violent stoned, just nutty and paranoid. I'll admit, I've gotten him stoned twice since then just because it makes me laugh my ass off to see him freak out. I know it's wrong, but it's entertaining.