Which of these short stories was made into a 2013 movie directed by Ben Stiller?

Walter Mitty is a bachelor with a daily routine, day-after-day he follows the same routine, down to buying the paper from the same place and eating the same dinner at the same place each day. His company hires an efficiency director, a big, bossy, bulky woman, who is threatening to close the routine of Walter's work area. Walter meets her one night and convinces her that he is a lot more dangerous than he looks at work. this is a classic tale, take the time to read Thurber's short stories they are too funny. I know you can find the Secret Life of Walter Mitty online.

Also filmed in 1947 starring Danny Kaye.

Player #12046674, I kept waiting for one?

I wonder what the story was about, it would have been nice to have had a short outline.