Mr. Paperbag is Returning

I have an idea! :D This is meant to be more of a quick story. I can't give you a better description, but it's meant to be a quick idea. I'm more likely going to do this as a film. It sounds possible.

Here's the idea:

2 guys in one dorm room. Everything seems to be going alright. Suddenly there's a knock on the door. One guy decides to go check it out, but finds nobody. He thinks it's a prank of some kind. The moment he sits down comes another knock. This time, he rushes to the door and peers through the peephole but again, finds nobody.

He suddenly hears loud bang outside, and moments later the whole room shakes. The lights go out.

When the lights return, they panic. They attempt communicating, they yell, but find no help. Nothing is working. The two realize that there's nothing outside as well. Through the window they see absolute darkness as if everything had vanished suddenly. The windows don't open, nor does the door. They are trapped.

Then suddenly, a knocking on the door. Somebody is outside. Again, they peer through the peephole but find that it is blocked. The knocking becomes louder and more intense, as if somebody is upset. Then, it goes somewhere. The knocks travel around the door, to the walls, then to the windows. It circles the room.

Who knows where I will take the story from here. Who knows. Maybe it's Mr. Paperbag and he's coming back.