Why is it called a pig joke?

One day, a man walked into a bar, followed by a pig. The pig lost all four legs and replaced them with four wooden sticks as artificial limbs.

The bartender in the shop asked the man, your pig is really strange. Why does it have no feet?

The man replied, my pig is very powerful. I thought our family was still poor and lived in a hut. As a result, pigs sniffed around in the backyard and found oil, which made me rich, built a house and built it again.

Swimming pool.

The bartender was too surprised to speak. After a while, he asked again, by the way, what happened to his foot?

The man said: You know, my pig is very powerful. One day, my five-year-old child drowned alone in the swimming pool. As a result, he jumped into the swimming pool, took my son out and helped him cook.

Mouth to mouth resuscitation!

The bartender was even more surprised and asked, "What about his feet?" ...？

The man began to get a little impatient: I told you, this is a very powerful pig. One midnight, our kitchen caught fire. It woke up the whole family and put out the fire alone! !

Bartender: Sir! I mean, why doesn't your pig have feet?

The man replied with an unhappy face: If you have such a powerful pig. ...

Will you eat it all at once?