4 + 3 = 8? Whoops That's not right. Looks like a job for the eraserheads The three eraserheads--an owl, a crocodile, and a pig--live atop three pencils in the land of paper, rulers, letters, and numbers. Their job is to help a little boy correct his mistakes. But one day they make a mistake of their own--and what happens next is something nobody expected.