Story line: Coop & the balcony scene
The evolving story of how Coop is playing cupid for Phoebe while he is, in fact, falling for her himself is a direct homage to the story of Cyrano de Bergerac (a play by Edmond Rostand).
In that story, Cyrano is obliged to aid his less silver-tongued but more handsome friend Christian in wooing Roxane, a woman who he falls in love with. In one of the best known scenes in the play, Cyrano stands under the balcony of Roxane, secretly prompting Christian with words of romance.
In this episode, Coop stands under Phoebe's balcony, and similarly feeds Michael the romantic lines he uses to convince Phoebe to go out with him.