Dear loving god.
So I was in my tunnels that run under my single player city, so I can access other buildings in the dark of night without the fear of a creeper explosion or skeleton's arrow. I had crafted a ladder in my main skyscraper to fit into the entrance of a smaller building that acts more of a storage room.
It was bright as day outside, and after I placed the ladder, and climbed up it into the small building, a chicken jumps right in-front of the door's window. I nearly jumped 5 ft out of my chair as the evil eyes of the small harmless chicken stared at me through the small window. Anyways, after a few seconds of swearing at the animal, and then giving it a nice punch in the beak, I descended back into the dark underground tunnels of Trejirm.