The john "can""t afford o get stopped anywhere." He promises his lady of the evening: "There""ll be a big tip in it for ya if you do the right things.]The film""s screenplay (credited as being written by Frances Goodrich, Albert Hackett, and Capra himself, with additional scenes by Jo Swerling) was based on "The Greatest Gift," an original short story first written on a Christmas card by Philip Van Doren Stern.He hopped, skipped, and jumped to the porch""s front door (decorated with lattice-work).She let him in and then they shyly entered the living room parlor together, as the Sheik (a rival suitor - experienced, over-aged and villainous) appeared, entered he front door without knocking, and spied unnoticed on the young lovers"" gift-exchange on a sofa from behind a hallway curtain.To provide rescue, Batgirl exploded through the skylight ("You""re about to become compost") and fought martial-arts style against Ivy - kicking her into a Venus fly trap and then freeing the duo.