It does not necesarily mean you are insane. Sometimes, noises around your house can resemble the sound of the door being knocked. At other times, immature children - or even immature adults - may knock on the door, and simply run off, just for a laugh. Sometimes, if you have a habit of tapping without realizing it, you may end up tapping on a wood surface, and think it was the door, not realizing it was you.
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