Cats can't knock, but they can do other things.
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@catsalad The one musical instrument anyone of any species can play flawlessly.
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@catsalad You know what's coming but it's still fun to watch. 😆
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@catsalad My wife's cat growing up would stand in the hallway each night meowing loudly and mournfully. The doors were open, but she wanted to invited into someone's room for bed time.