Use chopsticks the right way, this simple guide can help
Tsukitatebashi (piercing standing chopsticks)
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In many Asian countries including Japan, sticking out your chopsticks vertically on your bowl is considered akin to the standing incense sticks lit up during funeral rites.
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Tatakibashi (drumming chopsticks)
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Grasping the chopsticks in your hand like drumsticks and clinking on the plates and bowls on your table is considered highly offensive.
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Hashiwatashi (passing food from one pair of chopsticks to another)
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In Japan, after a person is cremated, the family members participate in a ceremony that involves the passing of bones with chopsticks.
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Neburibashi (licking or sucking chopsticks)
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Chopsticks are meant to transfer the food on your plate to your mouth. It doesn't serve any purpose other than that.
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Sashibashi (pointing chopsticks at people)
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Just as pointing fingers at someone is considered a rude gesture here in India, sticking out chopsticks at people to point at them is rude too.