I can remember my dad visiting us back when we had a Maine Coon cat. It's tail looked just like a racoon's. My dad and I were talking in the backyard when our cat walked by. My dad said "if you followed that cat all day there is no telling what you would see." Apparently he was right.

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Your cats are sneaking off and getting Ninja training. Now it all makes sense. They sleep all the time because when you are at work; They are taking grueling Ninja training. That's why they are so tired when you get home.