Bell, Book and Candle (1958)

I've seen this movie a bazillion times and like it quite a bit. It's a cute, fun romantic comedy centering on Kim Novak, who is a witch, and James Stewart, who is bewitched. Jack Lemmon supports the cast as Novak's brother and Elsa Lancaster (best known, perhaps, as the bride of Frankenstein) is their aunt. The plot is basic romcom fare: girl meets boy, girl/boy likes the other, girl gets boy (with a little magic), and then hilarity ensues. Definitely worth watching, a bazillion times at that.