When a person is walking through a doorway and doesn't hold the door open while knowing that someone else is right behind them.
This act can be practiced everywhere, as long as there is a heavy door that does not remain open or slowly close, and is usually practiced by assholes, war-mongerers, and ignorant people.
I was walking into Blockbuster when a guy decided to drop the door on me. Hit me in the head and I got knocked unconscious!
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