Speednob became such an obsession in my school that it was unusual to see any ink-permeable surface without a nob on it. Eventually pupils were so alert to preventing their property being nobbed that it was very difficult for even the most committed player to nob anything at all. The only option for the potential artist was to draw a nob on the flat surface of an eraser with a cartridge pen and quickly use it as an ink stamp on the targeted item. So long as the victim didn't see you draw the nob on your eraser, he would be entirely unsuspecting and a swift movement with the eraser would ensure a successful nob placement on anything from textbooks to foreheads.

We would do speednobs by drawing the knob on our thumbs with a biro, then firmly planting the thumb on someone else's textbook. Rest of the lesson would be spent trying to get the knob off your own thumb.

(This is an idiot's version of the rubber stamp speednob variant. I love the mixture of make-do ingenuity and blind stupidity. - Log.)

Everyone knows that Swastikas are funny. Especially when drawn on a rubber, in reverse with permanent ink and then stamped on my friend's forehead during a German lesson.

You think people who draw cocks on stuff are stupid? Well let's see you pull this off. Go on, pull it off. You big gay.
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(Someone needs credit for this, as it obviously wasn't me. It just got sent to me by someone who said he got it "on the internet".)