Tell me a joke about pigs.

Once upon a time, there were two pigs walking on the road. The pig walking behind asked the pig in front, "Where are you going?" . The pig in front didn't answer, and the pig behind asked, "Hey, where are you going?" The pig in front still didn't answer. At this time, the pig behind ran to the pig in front and asked, "Where are you going?" How can I talk to you without you? " The pig in front said, "We are pigs. Can we talk? "