Christmas is not Christmas without the Alastair Sim film of A Christmas Carol. This was the first version of that story I remember ever seeing in any format, and it's been a necessary part of every Christmas ever since my earliest memories allow me to recall. He goes from being crazed and bitter to crazed and comedic, with such warmth as not many could exude. I spend the entire film waiting for the last ten minutes, when he prances around his room singing the following, and scaring the crap out of his maid.

o/~ I don't know anything
I never did know anything
But now I know that I don't know
All on a Christmas morning o/~