Once upon a time, a strange creature appeared in the forest.  Its name is Flat Tu.  It was a very strange looking creature indeed.  It looks like a ghost but explodes every few minutes and comes together again.

As the animals met the strange creature it was both attracted to it as well as repelled by it.  They took pity on the strange and lonely creature.  However, they wanted to get away from it because when it explodes, it smelled very bad.

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The animals did not know how to help it. 

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One day the creature approached the animals and asked for help.  They said that they would love to but do not know what to do.  The creature said that he knew how they can help it but only if all agree.  The animals said yes without realizing the consequence.

As soon as, they agreed, it exploded again but this time instead of integrating, it went into each of the animals.    After that the animals either started to fart or burp. 

It was later known as flatulence.