One day, they went for a walk together.
Mr Fly said, "You can't jump over this river!"
"Yes, I can! It's you who can't!" replied Mr Big Head.
"No, you jump first," said Mr Big Head.
So Mr Fly flew across the river.
But his head was so big that he started to sink.
But he laughed so much that his mouth tore in two from one side to the other!
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