In the movie Girl Happy starring Elivs Presley there is a scene in about the first half hour of the movie where Elvis brings this girl back to his room. He is singing to her and while doing so he is putting out a "Do Not Disturb" sign on the hotel room door, dimming the lights, taking the phone off the hook, and removes a book from his date's hands. Moments later while on the couch and kissing her the phone suddenly rings even though he just took it off the hook moments before!