Ahaha I used to do that. I absolutely hated Calculus class, and my teacher was a hippie type. "Spread the love, mon, spread the love." So I would teach him random signs and tell him it meant things like PEACE and LOVE. He never once doubted me. <grin> I taught him LIMIT, RATE, CALCULUS...etc. Gave me some sort of reason to stay awake in class.