He appears to be irritated or annoyed when he loses to someone but maintains his composure despite this. The bad part of this is that the chances of him starting to turn his surroundings into 3D, and with that destroying the world, increases, Dave doesn't have good control over the 3D world. It is revealed in the terminal texts logs that Dave turns the world 3D due to his interdimensional dislocation, which is triggered when Dave is under a mass amount of stress. He also speaks barcodes when 3D.