Lead poisoning
You risked this if you put a pencil in your mouth, even for just a split second. If you were stupid enough to even give the end of your pencil a little kiss, everyone would scream "what is wrong with you?" and "do you want to die or something?"

Some people would be so concerned about your well-being that they would punch you. Later, someone pointed out that the pencils were made out of graphite, and not lead. This didn't stop the panic, because graphite poisoning was about ten times worse, you fucking idiot with your crazy deathwish.

[log]If you do succumb to lead poisoning, your blood will turn black in your veins. This is only lethal when the black blood reaches your heart, giving you minutes to run around screaming "I can see it in my arm, I'm going to die".[/log]
written by excluded pupil, approved by Phil