Gumball and Darwin discover the real reason Dad's diet wasn't working. / When Carmen's nitpicking gets out of hand, Gumball decides to be the nitpickiEST. / The Wattersons discover a family of cartoon copycats who mimic their every move. / Gumball and Darwin give Bobert specific instructions to ensure he acts safely. When Bobert starts applying his robot logic to their rules they realise they must be much clearer.