Bubba and Billy Bob were the two star performers on their college football team. 

Their professor informed the team coach that their grades were below average, making them ineligible to play in Saturday's "Big Game". 

The professor agreed to raise their grades if they passed a test. 

The coach pleaded, "Make the test easy professor". 

The test was one, fill-in-the-blank question: 

While taking the test Billy Bob asked Bubba, "Hey Bubba, what's the answer?" 

Bubba made sure the professor wasn't looking and said, "FARM." 

Billy Bob then asked,"Hey, how do you spell farm?" 

Bubba said, "You big dummy, e i e i o."