Does someone ever say something that reminds you of someone else?

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Do people say things that are exactly like something someone else once said to you and that person would have no way of knowing someone else said it to you? For example, my grandmother was full of old wives tales. She would spit out at least two a day. (Maybe not old wives tales but sayings). She would say things like it's raining cats and dogs or get it straight from the horse's mouth. Anyway someone that never met my grandmother said something that was so much like what she said it was like De Ja Vu.