HAve to be, both Hancock if your looking for a fairly short but highly entertaining movie.
And The Chronicles of Narnia: Prince Caspian. If you are looking for a move that is a bit longer but an incredible watch.
I must say Prince Caspian has gone to the top of my all time movie's list. Not sure if it's gone to the very top yet, but certainly top 3. The Lion, The Witch and The Wardrobe was a very good film,and brought faces to the books main characters very well, but Prince Caspian, truely captures the book and brings the story to life. Having read the sptries countless times when I was younger, this movie has just brought back some incredible memories of it. From the slightly surreal first meeting between Lucy and Aslan when they return, to what was at the time a rather scary scene when Nikabrik tries to resurrect the white witch.
Just a brilliant movie you must see.. I can only assume they will skip ahead to the last battle, although I'm not sure yet how they'll be able to finish the movie.