There was a similar ad a while back, think it can be found on YouTube, of a similar scenario.
Except that the young woman grabs her handgun, which is the first thing the assailant sees when he busts through the door. And then promptly faints ...
That was a Glock commercial.
EasyBakeGunClub just put up something similar:
http://youtu.be/QTOLSmxqcMo