So, there's this farmhand who goes to work on a farm, he's in the yard and he sees this pig with only three legs.
He asks the farmer, "What's with the pig there?"
The farmer says, "Well, a few years ago, the farmhouse caught fire and that pig ran in, raised the alarm, saved me, my wife and all three kids. We'd have burnt to a crisp if it wasn't for that pig."
The farmhand says, "But how did he lose the leg?"
And the farmer says, "Oh, right. Well, with a pig that useful, you don't eat him all at once."
