Yes! Ta-pocketa-pocketa-pocketa-pocketa-pocketa.
God, I loved that story the first time I read it. And, when I was a kid, my dad took me to Lincoln Center to see a film festival, and the Danny Kaye version was part of it. Only one of the movies I remember, in fact.
In the story, as I'm sure you know, absolutely nothing actually happens to Mitty. It's entirely daydreaming. In the Danny Kaye version, a 1947 production, Mitty becomes a kind of accidental hero. And this Ben Stiller version has pretty nearly nothing in common with Thurber's story. I wonder if it's any good.

I am a huge James Thurber fan. I always imagine him to be a bit like Walter Mitty. I think he was.