A trip to the dentist
Roger Corman shot the entire film in two days and a night on sets left over from another production, mostly to test how fast a feature could be made on a bet. He never bothered securing the copyright, evidently not expecting it to have value beyond a quick theatrical run -- which is exactly why it's free to use today, while the 1986 musical remake it inspired stayed firmly copyrighted. This dental-office scene is also where a 23-year-old Jack Nicholson turns up in one of his first film roles, as the patient who shows up next and can't wait for his turn in the chair.