"I overheard one youngster asking another: "Has he grilled you on the causes of fits in calves yet? Don't worry, he will." That made me feel suddenly old but there was compensation on another occasion when a newly qualified ex-student rushed up to me and offered to buy me all the beer I could drink. "You know what the examiner asked me in the final oral? The causes of fits in calves! By God I paralysed him--he had to beg me to stop talking." And"