I think that there are unknown things out there that cannot be explained by science, whatever they may be called. I've actually had two experiences which reinforce this.

Almost 20 years ago a friend of mine and I went to the Bennington Battle Memorial, aka the "Psychic Center of the Universe." (It's an obelisk.) On the way back, it was dark, but very clear. All of a sudden there was this "fog" on the road which gave us the creeps, and my friend swerved to miss it. We called it "the demon on Route 7".

The second one was when I lived in an apartment. At the time I had two cats, Smokey the Elder and Mobius. They would stare at a particular place in a corner of the ceiling. There was never a bug, shadow or any other reason visible to me or my SO. When we moved to our house, they never exhibited this behavior.

Things that make one go,,,hmm.