Why do we sometimes feel an eerie familiarity with strangers, like we’ve met them before?

This feeling is a form of déjà vu, where your brain mistakenly recalls a situation as familiar even though it’s new. It might happen because the stranger’s appearance, mannerisms, or surroundings closely resemble something from your past, triggering a sense of recognition. It’s like your brain is doing a double-take, trying to place the person in a memory that doesn’t actually exist.