Two cowboys are riding the range on a bitterly cold day when one of them vaults out of the saddle and picks up a piece of a frozen cow pat.
He rubs it on his mouth for a moment and then throws it away. As he remounts, his pard gives him an odd look, so he grunts "Chapped lips".
"I see," says his pard. "That helps 'em heal, does it?"
"Nope," says the first cowboy, "but it sure stops me lickin' them."