Focus
Bobby always hated when Eames tried to do this to him. Of course, he hated this prank in any situation, find the thing in the video that is out of place, or follow the ghost car to see whether it was really not being driven. Then, as his concentration was at its highest point, something would jump out to scare the shit out of him. He hated how often that happened, something unexpected intruding into his life, like I just walked from the doorway into your room as you were reading this.
Happy Halloween!