Franek had a smile as wide as his favourite green hat. One sunny afternoon he went to the park to do a puddle jumping competition. On his head, of course, was his hat, which he always wore on a tank top. Franek jumped into the first puddle - splash! The hat jumped up. Then he jumped over the second one - splash! The hat shook with laughter. But just as Franek was preparing for his third great leap, a strong wind suddenly blew! The hat flew into the air, did a pirouette and.... flew between the trees. - Hey, come back! - cried Franek, running after his hat. On the way, he passed a park bench where a squirrel in sunglasses was sitting. - Your hat dances better than me! - she called out and waved her paw. Franek rushed on. The hat glided in the wind, flying past the swings and the sandpit. That's where Zosia, who had just been building sandcastles with a a big moppet called Bubble. - Have you lost something? - Zosia asked. - My hat is running away! - replied Franek and all three of them set off in pursuit: Franek, Zosia and Bubbles. Then the hat flew over the pond, stopped for a moment at the top of the frog statue and flew straight into the thick, green grass, where strange giggles could be heard. Frank and his friends approached cautiously, and that's when they saw it.