My Angry German Shepherd Destroys a UPS package

My dog hates it when a mailman comes by to drop off packages. When he leaves and I step outside to get the package, my dog is so frustrated he is ready to attack anything that's behind that door. Well, the only thing behind the door at that point is the poor package and oftentimes it becomes the victim. In this video I want to demonstrate the kind of aggression he unleashes on the package. But also please note how I can recall him with relative ease.