We haven't done it in a long time, but we saw two movies back to back yesterday.
Harry Potter and the Prisoner of Azkaban
Another great Harry Potter movie. I liked the way they are allowing the characters to grow from childhood into young adulthood. I also think this particular Potter film is the darkest so far (as was the book). My only complaint was that the climax of the film was paced too quickly, and if you hadn't read the book, you would have had a hard time keeping tabs on who the Good Guys and the Bad Guys were. The scenes between Harry and Professor Lupin really make the movie, from an acting standpoint.
Day After Tomorrow
After Potter, we bought tickets for a showing of Day After Tmorrow. The special effects were the main character of the movie, and I wasn't too impressed with the acting. There were some good actors in it, but their main job was to deliver the lines and not to upstage all of the CGI. As can only be expected from the movie's premise, much of the film took the spin of a really long Greenpeace commercial (a lot of "Gee if you gray-haired blockheads had paid attention to us hippies 20 years ago you totally would not be in this situation") and there is one plot line involving CGI wolves that was just awful. I also couldn't help but compare the destruction of New York in this movie to the distruction of the same city in Deep Impact and note that the Statue of Liberty was permitted to stay standing in this movie. There was a hilarious scene where Americans were running the Mexican Border heading for warmer climate (a sore point here in the Grand Canyon State), and, while driving home after the movie in 110 degree heat, we thought a bit of a snow storm would have been sort of neat.