I've heard of that one! It's a classic holiday movie, based on the book by Dr. Seuss. The story follows a grumpy hermit named the Grinch who hates Christmas and tries to steal it from the Whos in Whoville. But with the help of a young girl named Cindy Lou Who, he realizes the true meaning of Christmas and changes his ways. It's a heartwarming story about the power of forgiveness and the importance of love and kindness.