One Sandwich Short of a Picnic

Victoria Coren presents this series about words, inviting the public to make a vital contribution to the Oxford English Dictionary. This programme looks at the many words we use for madness. Former psychiatric nurse Jo Brand returns to her old hospital, St Mary's Bethlem (Bedlam), to demonstrate how today's worst insults – moron, idiot, imbecile and cretin - were once official medical diagnoses. But who, for example, first went 'bananas' and why?