I remember my history master of genius, Dr Alan White, mentioned this history exam question
'Asquith was the last British Prime Minister not to travel by plane. Discuss'
saying drily (he said everything drily) we would be well advised not to answer this question.
Which reminds me of an exam question from Sellars and Yeatman
' "Cap'n are't thou sleeping down below?" Candidates are advised not to attempt this question.'
Another exam question from the early 1970s
"The world owes more to Marks and Spencer's than to Marx and Spencer".
I think Harold Wilson may have made that pun first, though he omitted Herbert Spencer.