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The phenomenon that occurs when one person tries to pass by you in a hallway or some other narrow passage and you both switch sides to get out of each other's way, therefore defeating the point of changing sides, causing you to switch sides again, however, the other person also got the same idea and tried to switch sides again, causing you to both be caught in the same predicament once again. Coined by Stephan Pastis in Pearls Before Swine
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