Justin in the movie Proof.

Look for him at about 36 -37 seconds in the clip above walking across the set on a cell phone right in front of camera walking from right side of your screen to the left.
Justin was an extra in the movie Proof and I finally tracked it down and made a clip for your viewing pleasure. One clip shows the scene as it appears in the actual movie and the other clip is slowed down to better appreciate the true hero of the film. Justin Marcucci.