This zombie walks into a bar with a three legged pig under his arm and orders some pork brains in milk gravy. The Bartender sets him up and says "We don't get many zombies with 3-legged pigs in here. How come its only got 3 legs?"
Zombie has a bite of brains in milk gravy and says "Well back when I was alive, I didn't look before crossing the street and was almost hit by a truck, but this pig ran into the road and knocked me to safety."
"Oh" the bartender says "and the pig got hit by the truck and lost his leg?"
"No" says the zombie. "Well how did he lose the leg?" demanded the bartender.
"Well, back, before I killed my kids and ate their brains, we were at the beach and while my kids were swimming in the surf, a great white shark came up to eat them, but the pig dove into the surf, fought that shark off and saved my kids."
"Wow" says the bartender, "So that shark bit off the pig's leg, huh?"
"No." says the zombie. The bartender loses his patience and tears one of the zombie's arms off and starts beating him over the head with it.
"(*&&^^&@!*%^!!! How did that pig lose its leg????"
The zombie gets up, reattaches his jaw and says
"Well, a pig this valuable, you don't eat all at once."