"Banter is often a proof of want of intelligence."

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I've noticed that the magic getting along with someone isn't really magic. If you break it down, you can see how it happens. You say something a bit off-center and see if they react. If they get it, they push it a bit further. Then it's your turn again. And theirs. And so on, until it's banter. Once it's banter, it's friendship.

— Meg Rosoff