As the clip starts off, you get to see how a TV is fitted to replace a window and prank people coming in for a job interview.
They are facing the screen, allegedly convinced that they are seeing a window. A clip of a meteor hitting Earth, with appropriate sounds in the background, is played behind the actor playing an HR rep.
They are terrified and proceed to try to run off and get away from the wall, just before the lights cut off.
I am not convinced that these are genuine reactions and not staged scenes. Nonetheless, the premise is funny, simple and imaginative and I have to give props to LG marketing experts for their ability to make ads go viral.