A demonstration of total, cute obedience. His face is adorable when he looks up sheepishly waiting for the signal to start eating. It is a super demonstration of trained-in self-discipline.
Below is a video from YouTube on how to train a dog to patiently wait for food and not bark.
Note: These are embedded videos from other websites. Sometimes they are deleted at source or a video is turned into a link which stops it working here. I have no control over this.
Below are some more articles on training.