Willy Nilly is off to the shop to buy a cabbage. 'Yuk!' he says. 'Don't say that, Willy Nilly!' says his mum. So Willy Nilly tries very hard to say the right thing - but somehow he always says it just at the wrong moment. 'Don't say that, Willy Nilly!' he's told. Will Willy Nilly ever get it right?