Did you start off screaming or did you try quiet yelps first?
The puppy I saw reacted immediately to a SMALL yelp, he jumped off the sofa where he wasn't supposed to be.
[Drat! It wasn't on TV that I saw this. It was at the home of a bachelor friend. He was doing it with his pup. We asked him about it...thought it was the best thing we'd heard about since sliced bread!]