When Happy's girlfriend walks out on him, Happy runs in to talk to her via the intercom. Happy does not close the door. Then, a little later, while Happy is still on the intercom the Chinese lady opens the door. How could she open it if it wasn't closed?
Yes, doors in apartment buildings are usually heavy and close on their own. But the strange thing is that you have to get someone inside to open the door for someone outside unless they had a key.
Two words, Bernoulie's Principal. A faster moving fluid creates lower pressure. So maybe the wind from an open window blew past the door, created a low pressure and pulled the door close. We just learned about that in science so thought I'd put it up as an idea.
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