Hillary Busis
May 03, 2012 AT 05:16 PM EDT

Jonathan Hayward/The Canadian Press via AP

Poignant, daring, and set entirely within the walls of one seriously mysterious attic, Who Is “Mark Pelpy”? — a CGI-filled thriller starring Amy Poehler and Jimmy Fallon — is one of film history’s greatest mysteries. Or, at least, it might be… if it were real.

Both Poehler and Fallon had an opportunity to exercise their improv comedy muscles on last night’s Late Night. The game: Fallon pulled out a succession of ridiculous posters for fake movies he and Poehler had supposedly starred in together. The host and his guest would then spend a few minutes riffing on each faux flick, filling in plot details and making up behind-the-scenes tidbits. (Connect Four, for example, was shot in Yugoslavia. Naturally.)

Want to know more about the pair’s fantasy epic (Chronicles of Holkroft 3: Quest for the Krimson Amulet), or their British comedy of manners (Her Royal Heiny)? Of course you do! Check out the entire bit below.

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