Chinese tourists taking video through glass into a cathedral in Scotland got what they think is the image of Princess Di's ghost.
Well, as an investigator, I can tell you that pariedolia (seeing shapes and interpreting them as an object) is so common, it can make you cross-eyed dealing with it. Here's a great example. Do you see the head of Jesus on this photo below?
Look closer. It's a couple holding a baby on the father's lap. The baby is wearing a bonnet which makes what looks like Jesus's forehead and the baby's shadowed face is what looks like Jesus's eye socket.
Baby Bigfoot swinging in a tree? Look at the tree's response to the "swinging baby ape?" A black trash bag from the campground caught in the tree--the tree does not move. It is obviously caught on a branch and fluttering. It catches the breeze easily like a lightweight sail.