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.

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

Last month on the Late Late Show, Ben Schwartz explained how J.R. was conceived after Steve and Nancy got close after the traumatic event in the Upside Down. Barb would not approve.

Still missing in the theory? How one Mona Lisa Saperstein fits in. It's possible she could be a biological Saperstein, or she's the lost twin not even Steve and Nancy want to acknowledge.

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