What would you do if you saw your best friend's significant other on a date with someone else?

The crew sets up in New York's Greenwich Village, where David and Mary Ellen, a devoted couple of four years, live together. David and Mary Ellen are both in on the experiment—but Mary Ellen's best friend, Kiley, is not.

David and an actress pretending to be his date are shown to a cozy table in an Italian restaurant just before Kiley takes her seat in the same restaurant. Thanks to a strategically placed mirror, Kiley has a clear view of David and his date. At first, Kiley insists to her friend that the man they see can't be David…but after time, she can no longer deny it. Kiley decides to send a warning text to David: "If it is you, I am here and Mary Ellen is on her way."

As part of the plan, David and the actress are told to look embarrassed and leave the restaurant.