Have you ever felt like this?

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I've observed many times that when two people look similar (a particular facial feature, body structure etc), I find that they have certain similar traits. Like I knew two people who looked similar and who had very similar voices. There were other incidences where I felt like they walked the same, had peculiar habits (like flailing their arms while talking, rolling eyes etc). Is it all in my head? Has anyone noticed this and ever wondered about it?