To quote a user review from imdb:

>My father and brother would watch this movie together. They knew the plot and lines well enough to recite them, along with the actors. The movie bled over into real life, and they would say the lines to each other when the moment felt right.
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>As my father descended into terminal Alzheimer's disease, this film was his one last link with reality. Watching this film would bring him out of his stupor, and he would become verbal again.
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>Now that Father is gone, the entire family watches this movie once a year,on Christmas Eve. We make eggnog, eat fruitcake, and wear sweaters. And cry some, too.