"A Miracle On 34th Street" (1947)
This 1947 movie is one of the best Christmas movies ever made. A heart-warming tale about the character Kris Kringle and his attempt to convince the world that he is, in fact, Santa Clause. This leads to a series of events in which his sanity is questioned. All in all, without wishing to divulge too many details, this is a must-see for all of the non-believers out there!