Chapped lips

Two farmers are walking through a field. One stoops down and dips his fingers in some cow dung and rubs it across his lips.

The second farmer asks him why he did such a disgusting thing.

The first farmer replies, "I have have chapped lips."

The second farmer asks him, "Does it make them better?"

"No," replies the first farmer,

Spoiler:

"but it stops you licking them!"

Erghhhhhh !!!!!!!!