Pocoyo has a new game which he enjoys playing on his friends: BOO! Only some of his friends find Pocoyo's game annoying or frightening. But this only encourages Pocoyo more. He boos poor Pato til he ends up a nervous wreck. Elly sees how scared Pato has become and decides to give Pocoyo a taste of his own medicine. Elly makes Pocoyo jump. At first Pocoyo doesn't like it but ultimately Pato and Pocoyo both realises it can be fun to BOO! and to be BOOED!