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The internet was abuzz this summer with the universe-crossing fan theory that the beautifully coifed Steve Harrington from Stranger Things (Joe Keery) is the biological father of present-day Hoosier Jean-Ralphio Saperstein from Parks and Rec (Ben Schwartz). James Corden got the two together (sadly not in a car) to explore the father-son connection.

The two took photos behind the scenes, and the world turned Upside Down.