During one of my trips to one of the pig ruins, all the rooms had the fly sounds from poop. It wasn't until after I removed poop out of bounds (where I assume the poop existed in another room like a pig shop.) the sound stopped.
Steps to Reproduce
1. Have poop in another room 2. Travel through another room. 3. Listen to the dance of the flies.
1. Have poop in another room 2. Travel through another room. 3. Listen to the dance of the flies.