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Once upon a time, there was a boy and a girl. the boy asked the girl to marred him. the girl agreed, and said the boy must kept the promise about identity the girl as a fish. he kept the promise. then one year later, they had a son, his name was sam. mother asked sam to gave a luch to his father in rice field. but, he was very hungry then ate the lunch. his father was angry, and told him that he was a son of fish. he was crying and told his mom, his mom angry to his husband to told the secret. se left her husband and son, then suddenly the floods came and became a big lake it called Lake Toba.