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Like in the car, everyone always has a headrest, no worries.
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Rubbing the nostrils or merely trying hard to not breath?
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Thinking twice (or about peace) before uttering any word.
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Teachers used to say, whenever you wanna drink, turn your head 180 degrees.
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And the clapping etiquette always happens just because the MC says give a round of applaud, but it will always be quadruplet-fold or even more.