In Bell, Book, and Candle, Gillian Holroyd (Kim Novak) met her upstairs neighbor (James Stewart) and was intrigued. When she found out he was about to marry her old school rival, she cast a spell using her cat Pyewacket to make him forget his girlfriend and become infatuated with her. Though he eventually finds out about the deception, it's too late...he's fallen in love. Unfortunately for Gillian, she fell in love, too. The problem...when a witch falls in love, she loses her power. Sadly, in addition to losing her power and her familiar, she loses all sense of style. In the end, Gillian is no longer selling exotic tribal art or dressing in cool, dark and sexy clothes. Now that she is mortal, she is selling seashell flowers (yawn) and dressing in boring white bland clothes. It's a good thing that didn't happen to Samantha on Bewitched, or the show would have been over by the pilot and eight seasons would have been lost to us.
A little sidenote...Mom Smackley and I have a cat that we named Pyewacket because of this movie.