It's happened to everyone who takes the metro at least once. 

You walk up to the metro station door and try to push it, but it won't open. You put some back into in and push as hard as you can until finally the door cracks open and you get punched in the face with a blast of wind. 

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Hell hath no furry like the wind that comes out of the metro.

So the next time you're having a hard time opening the metro doors, don't be a fool, simply step aside and let the next unsuspecting victim do the hard work for you. 

Otherwise this will be you: