The 1966 animated film "How the Grinch Stole Christmas" is a classic Christmas movie that tells the story of the Grinch, a grumpy hermit who lives in a cave on Mount Crumpit, overlooking the town of Whoville. The Grinch despises Christmas and plans to steal it from the people of Whoville, but when he sees the joy and happiness it brings, he realizes that he's missing out on something special. The film is a heartwarming tale that emphasizes the importance of generosity and kindness during the holiday season.