(a) To John, her next door neighbour, £50 for repairing Diana’s fence blown over in a storm, while Diana was away on holiday two months ago;
(b) To Sally, the girl who lives across the road, £25 if she will look after and take good care of her cat, Sheba, while she and her husband are away on holiday next week. Shortly after making this promise Diana discovered that her husband had already agreed to pay Sally £15 if she were to feed Sheba during this period;
(c) To Mandy, a local policewoman, £100 for arresting a burglar as he was leaving Diana’s house with a valuable painting under his arm.
What are the downsides?