(Oldie) A city boy goes to visit his grandfather's farm in the country. A he was walking along the fields, he noticed something very odda pig, sitting under a tree, with a peg leg. Later, as he was eating dinner, he asked his grandpa: ""Hey, why does that pig out in the fields have a peg leg?"" ""Oh, Old Jim?"" his father replied. ""Well, that's a very special pig. Saved my life."" ""Oh, really?"" said the son, amazed. ""How?"" ""Well, it was this one night. Your grandmother had gone to bed, and I had dozed off on the couch after a long day's work. And somehow, over the night, some gas had leaked. Now, I didn't notice this, the wife didn't notice this. Instead, Old Jim, really Young Jim at the time, found the scent. So he sprang up, simply walked over to the couch, and woke me up. Good ol' pig."" ""Yes, but still doesn't explain the peg leg."" ""Well, if you want to know that, there's another story. I was heading home, having prepared to set up a fence 'round the west field there, when, all of a sudden, I twisted my ankle hard in on of the post-holes I'd dug. Now, I'm no spring chicken, so I was twisted in a right state. Sure I would die out there, I heard this noise, and, oh, what a wondrous noise. Old Jim, the bastard, had heard me cry out. As soon as he saw me, he just squealed, turned tail, and ran for the neighbour's boys, the fit young lads by the river. Within the hour, I was back at home, with ice on my foot."" The son was beginning to get annoyed. ""All right, Grandpa, he's a good pig, but why on earth does he have a peg leg?"" ""Well, I'm not going to eat a good animal like that all at once!""