Before this is locked- I'm gonna just gamble and say "no". Nobody would be that stupid- they would use a gun, or something a little more normal.

However, if the pencils were long and sharp enough, and the lead strong enough (say 3h or above) you could concievably penetrate your own brain that way, since the pencil tips could penetrate the olfactory receptors at the top of the nostril. However, it's not really guaranteed that you would die- in fact there would be a good chance of survival, although your personality would be grossly affected: you would become rude and ignorant of social conventions, such as not pissing (or, unfortunately, crapping) in the street.