The farmer is sitting on his front porch and up walks a young fella: "Hi! My name's Joe! I'm here to pick up Flo! We're going to the show! Is she ready to go?"
So the farmer goes into the house and returns with one daughter.
Time passes and another young fella walks up: "Hi! My name's Freddy! I'm here to pick up Betty! We're going out to eat spaghetti! Is she ready?"
So the farmer goes into the house and returns with another daughter.
Time passes and another young fella walks up: "The name is Buck." and the farmer shot him.