True bromance.
Paper Towns author John Green and actor Nat Wolff are real-life best friends.
Daniel Dalton / BuzzFeed
But how well do they know each other? We decided to put that to the test.
They were pretty confident, with some fighting talk for famous BFFs Sir Ian McKellen and Sir Patrick Stewart.
Daniel Dalton / BuzzFeed
Here we go...
Daniel Dalton / BuzzFeed / Thinkstock
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John Green And "Paper Towns" Star Nat Wolff Prove How Well They Know Each Other