[shinjitsu]

In my high school a few years before me there was a legendary cheating ring that would tap out the answers to each other in Morse code which was presented as tapping a pencil eraser on the desk like they were thinking. Unfortunately for them it was long enough ago that one of the teachers knew Morse code and so it didn't last.

[agumonkey]

Oh weird, a HS friend that was failing urged me to follow this idea. I don't know if he heard of it or if he invented it on the spot (necessity mother of invention etc). We only used it once and it raised his grades by a lot obviously.

[antifa]

Should have used rot13.