The Secret Life of Walter Mitty. Through the first third I was resisting it, but eventually got into the spirit of the movie and by the end was won over, with a tear or two in my eyes.
It is loosely based on the short story, which I vaguely remember as having an unresolved, sad ending. More portrait than plot. This version, directed by Ben Stiller is all plot. He stars in the title role playing Mitty as an understated, quiet, unfulfilled but not resentful guy. His lapses into over-the-top daydreams contain excellent special effects, but I didn't find them as funny as they were supposed to be.
Once the plot gets rolling it is a fun ride. The secondary characters are all great, and Stiller's stalwart, focused, and slightly deadpan performance carries it away.