Mrs Black was having a lot of trouble with her skin, so she went to her doctor about it. He could not find anything wrong with her, however. So he sent her to the local hospital for some tests. The hospital, of course, sent the results of the tests direct to Mrs Black’s doctor, and the next morning he telephoned her to give her a list of the things that he thought she could not eat, as any of them might be the cause of her skin trouble.

Mrs Black carefully wrote all the things down on a piece of paper, which she then left beside the telephone while she went out to a ladies’ meeting.