That's funny as hell. And sometimes, harmful as it may be, crime is funny (hey it's popular in TV and movies!)

That would not work with my dog. She would bark at and bite the person. She's part Mastiff so the guard tendency is in her.

There's an little experiment up on youtube somewhere of people testing a dog's reaction to an intruder. A lot of the dogs do nothing but keep napping. Only one ran up to the intruder and starting Alarm-Barking. It was only a sample of five or so dogs but...if you want a dog that guards, you gotta get one of the guardian breeds to be sure!