Ace of Spades
During the Vietnam War, there was a superstition about the Ace of Spades card. In Vietnam, the local people believed it was a symbol of death. A U.S. playing card company shipped crates of these cards to Vietnam in an effort to terrify the local people during raids.
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Rice
Rice is everywhere! Most people eat it with every meal in Vietnam. It is common to be served several side dishes and to load them up on a giant bowl of rice.