Why Do People Sometimes Say ‘I Know You’ When They Meet Someone New?

Sometimes, when you meet someone new, your brain thinks they look familiar, like you’ve seen them before. This happens because the person’s face has a shape or feature that reminds your brain of someone else you know. It's like when you see a dog and think it looks like your neighbor's pet! Your brain just made a quick guess and said, 'I know you!'

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Examples

  1. You meet a new teacher, and they have eyes that look just like your mom’s, so you say, 'I know you!'
  2. At a party, someone walks in wearing sunglasses, but their nose reminds you of your brother, you say, 'Hey, I know you!'
  3. You pass by a stranger on the street, and for a moment, it feels like they’re your best friend, even though you've never met.

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