Pencil stories

I had an teacher once who would come round to your desk, and if you had a HB pencil would, without hesitation, throw it out the window (we were on the 5th floor).
 No pencil lighter than a 2B was his rule and I find that even today, nearly 20 years on I still shudder at the sight of a H pencil in my drawing classes and find myself thinking, I'm gonna do it, I'm gonna go and throw that damn abonimation of a pencil out the window, but I don't mainly because I teach on the ground floor and I don't think the effect will be the same.