Two hillbillies approach each other on a country road. One is carrying a sack over his shoulder.
"Hey, Billy Bob," calls out to the other, "What you got in that sack?"
"Some chickens."
"If I guess how many chickens you got, will you give me one of them?"
"Heck, Joe Bob, if you guess how many chickens I got in the sack, I'll give you *both* of them."
"Okay. Er... Five?"