A man wakes up after spending 20 years in a coma. One of the first things he does is ring his stockbroker. ‘Your assets have increased considerably,’ says the stockbroker. ‘The £20,000 you had invested with us is now worth £20 million.’ ‘That’s fantastic,’ says the man. Just then the phone starts bleeping and a recorded voice interrupts, ‘To continue this conversation please insert another £500,000.’