Buried pig dream

I had an odd dream last night. I dreamt that there was a party in my front yard, late at night, and I was getting very upset because I didn't know any of the people and they were acting very crass (obviously drunk). I was out there trying to get everyone to go home, and then one of the people started digging under the huge tree that stands in my neighbors' yard (but right next to my driveway). I screamed for them to stop, because bad things were under the tree, but they didn't. Suddenly someone screamed, "Why is it moving?!" and I ran over to see. There was a huge, hippo-sized pig buried beneath the tree. It was clearly dead, but it was getting up anyway. It was some sort of zombie pig, I guess. But the people didn't care -- they were trying to tie it down on a fire to eat it, but it just kept screaming. I woke up, but the pig's shrill screams were still sounding in my head for a long time after that.