I just got back from seeing An American Carol. It was quite funny and somewhat moving. I highly recommend seeing it. It was LOL funny in many parts. It suffers a bit from not quite knowing what it wants to be - a retelling of A Christmas Carol or a new version of Airplane! It settles for being a combination of the two.
In the story, film maker Michael Malone (read: Michael Moore) is visited by three spirits who try and convert him from his anti-American bias to love of his country. When it works, the spirits use slapstick comedy and harsh truths to make their points. When it fails, it's because a comedy can't be as brutal as such a conversion story needs to be.
I'll leave the theater trailer with you here and if you've seen it, I'll engage in some spoiler discussion in the comments. I don't like many movies these days, but I really liked this one.