A man had a pig that he treated like a pet. The pig was VERY smart (most are), and the man had taught the pig many tricks. One day, he showed the pig off to a large group of people, who were very impressed with the pig's intelligence and the tricks it could perform.
A few days later, the man was seen walking the pig down the street, but the pig was missing a hind quarter and limping badly. Several people who had seen the pig perform tricks a few days before were very concerned and all asked about the pig.
Finally, in self-defense, the man proclaims "HEY! If you got a pig THAT good, you don't eat it all at once!"