I also have a opossum story. Many years ago, when I living in North San Diego County, I had a doggie door for my dog and two cats. Not long after my dog died a opossum was walking through the living room as if he owned the place! I went and got a neighbor, but by then the opossum had left. Apparently, the presence of the dog had frightened him off, but the presence of the cats did not. It was the cat food that attracted him. He'd stand on his hind legs and reach down into the trash to get the cat food can! Opossums really like cat food! My presence didn't seem to scare him at all. He didn't try to attack me, but God forbid someone take the cat food! Ugh!