What do you do with a ball obsessed dog?

In the photo, I'm with Bud at the bay and he gets obsessed with the ball. Sometimes he'll bark right in my face. He'll be really gets demanding and excited. To solve this problem my trainers have told me, "turn your back to them." "They don't get the ball until they're quiet, calm, and sitting." It might take a while, but I've tried everything I could think of. When he does this now, I sit quietly with my head down until he is calm and quiet. Whatever you do: DO NOT give them the ball just to shut them up. Get back to me with your comment on how you solve obsessive behavior in your dogs.