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what decide sound seem happy

On the last day of the year, people in Spain wait until 12 pm. Everybody must have twelve grapes to eat at midnight. At each of the clock, they must eat a grape. But it difficult to finish eating the grapes on time. Usually People's mouths are still filled with grapes when the clock stops. They look at each other and start to laugh . This tradition started in Spain long ago. One year, when there were a lot of grapes, the king of Spain to give grapes to everybody to eat on New Year's Eve. People felt thankful for the king had done. From then on, eating grapes on New Year's Eve has been an interesting tradition in Spain.