Chair Nobs
Large cocks drawn on the seats of chairs so that it looked like you had your flaccid member nestling on the seat between your legs. Tipp-Ex was ideal for adding two or three drops of flying jism.

Not to be confused with a more sinister nob, drawn further back on the seat. If you sat on it this meant that you thought it was a real nob, and you had leapt onto it in the hope that you would get bummed by classroom furniture.
written by St*phe* N*ona*, approved by Mansh