My Math teacher assigns us essay on anything we want if we don't get our tests signed by our parents. He was one of the best math teachers I've had. 

Props Cuffaro.

P.s Sha-Nay-Nay is pronounced Sha as in the first part of Shakira and then Nay as in what a horse would say and then another Nay so what a second horse would say.

Put it all together and you have Shakira sounding like two horses. 

Sha-Nay-Nay.