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Have you ever heard of the 'cat mirror theory'? It's the idea that when cats see their reflections in a mirror that they don't recognize themselves and instead think they're looking at another cat.

**Related Video Above: Kenny meets a piano playing cat with over 4-million YouTube followers CLEVELAND (AP/WJW) — The best of the internet’s cat videos are coming to the big screen this weekend. Cat ...

Add Yahoo as a preferred source to see more of our stories on Google. Photo Credit: @tacothegingerr / Instagram Cats are full of personalities. Sometimes it is hard to predict their mood and behavior.