Once upon a time, there was no rain for long, long time. The ground cracked all over, all plants withered, animals had to suffer from thirsty.
There was so great a toad that he tried to find way to the heaven to let God know what life on the earth stood. He departed his trip and on the way to the heaven he was supported and followed by a crab, a bee, a fox, a bear and a tiger.
At last they all were at the place they wanted to come. The toad saw a drum at the heaven's gate so he asked the crab to hide himself in the jar of water then told the bee to take shelter behind the door. After all he suggested the rest to wait outside and came back when needed. Then the great toad marched forward and took the drumstick and beat the drum far-resoundingly. Thunder genie was asked to come out to see what happened. He immediately turned back and said that there was no one but a little toad himself beating the drum. The news was annoying God so he asked a cock to peck the obstinate toad. However, this cock was unlucky one, he was killed by the fox after he fulfilled the duty. Suddenly a dog appeared and tried to attack the fox but it was the right time for our bear showed his power. The poor dog was hurled down right away and died an instant death.
The failure was instantly broken to God. He was extremely angry and sent Thunder genie out to punish troublemakers at gate. The genie violently came out with his thunder maker, unfortunately he was attacked by the bee as premonition. The genie was so frighten that he had to jump into the jar of water and immediately jumped out because it was impossible for him to continue suffering pain from the crab's sharp pincers. At last the tiger showed himself so bravely that made the violent genie stood as a stone status.
God was in an awkward situation so he had to invite the great toad and all of his friends into the court. The toad after that told God that there was no rain in the earth for four years. Everything had faced death. If things went on like that, there would be nothing survive.
God was very much afraid of the earth's rebel so he immediately made rain and carefully told the toad just to grind his teeth if the earth needed water. From that day on it may rain if toad grinds his teeth so there is a Vietnamese saying:
"Toad is god's uncle
Beat him, god beats back".