She is drawing a supportive, cantilevered bra for an advertisement.In a chair next o her is the San Francisco man who survived the gutter pipe experience.A disabled John "Scottie" Ferguson (James Stewart) [the initials of his name, ""SF,"" mirror the abbreviation for the vertiginous city] is recuperating with psychological and physical scars.It somewhat resembled star Humphrey Bogart""s earlier filmThe Petrified Forest (1936)about another hostage situation.To make a statement, her "John Doe" also promises to commit suicide by jumping from the roof of City Hall on Christmas Eve.He flirts back and inquires about lovebirds [and the human varieties of ""birds""], specifying his need for birds that are neither too "demonstrative" or "aloof" - "just friendly":Melanie: Lovebirds, sir?Mitch: Yes, I understand there are different varieties.