White Christmas.

I have to say I agree with a lot of the negatives that mikef6 describes. That said, notwithstanding its flaws I always enjoy watching this film, I think as much for the music as anything else. Cinematically, i.e. in terms of the widescreen format, it's a major disappointment -- very proscenium in its approach, though I know Michael Curtiz knew better (although, in the early days of that format many directors didn't handle it well). But I love the songs and the fun of it it, so I forgive all its flaws.

And I love seeing Mary Wickes in anything.