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..who are four feet across, who are walking with both arms and legs sticking as far out to the side as possible, also have to walk RIGHT DOWN THE MIDDLE of the hallway?
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Every alien in every sci-fi movie of the 1950s. Then they try to eat you.
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so they don't accidentally bash their knuckles against the walls?
Their eyes are in front, so they think the hallway is empty. Don't notice the crowd stuck behind them.