We report the case of a 69 year-old man who suffered head trauma in a road-traffic accident. Subsequently, there was personality change, memory-impairment and the persisting 'delusion' that he had been involved in an earlier car-accident. On the basis of detailed interviews with the patient (and his wife), we provide an explicit account of how the content of his reduplicative paramnesia could have arisen. We are concerned to stress that the patient's 'delusion' is a belief held on reasonable grounds.