Two brothers are separated at birth, one going to live in the big city and the other on a farm in the coutry. Eventually, the two learn of each other and there's a happy reunion on the country brother's farm. Having never been to a farm before, the city brother asks for a tour. The farmer shows him the cows, the barn, horses, and the corn fields before coming to the pig sty, where he proudly introduces his prized possesion: a three-legged sow.
"That sow is finest animal to ever live," proclaimed the farmer, "She saved my three children from the barn when it was burning down."
"When I fell from the tree over yonder, she ran all the way to town and fetched the doctor," he continued.
"And, when my wife went into labor in the middle of the night, she delivered my yongest son!"
Amazed, the city brother remarked, "that's quite a pig. But, what happened to her that she only has three legs?"
"Well, hell," said the farmer, "be a damn shame, eat a pig like that all at once."