A 65-year-old ex-mathematics and computer teacher had an apparent sudden change in behaviour. He stopped playing his weekly football, stopped tutoring (transfer test for primary-school students), went to bed at 18:30 and slept with the light on. His wife noticed that he had become more anxious and less adventurous. He was more easily irritated by noise. His wife also reported that he had become somewhat panicky when driving. He had stopped driving for about a year prior to assessment. His wife revealed that he had become disinhibited, became acerbic with people and had difficulty engaging in social conversations. He needed prompting to shave and change his clothes.