Whip It

The referee says "23" in the trailer, calling in a rollergirl.

Chicken Run

One of the Chicken Coops is #23.

Real Genius

Several 23s on paperwork in the opening sequence and throughout the movie.

The Secret Lives of Bees

There is a 23 on the Calender.

Submitted by Candi

There Will Be Blood

When Daniel Plainview leaves his son on the train, the last 2 numbers of his license plate are 23.

Jeanne Dielman, 23 Quai Du Commerce 1080 Bruxelles

The title says it all!