I have always hated it when teachers try to be cute.
Way back around the end of the Pleistocene Era I was forced to take History 101/102 because World History was a required subject for all freshmen at the college I attended. The final exam for second semester consisted of one question: "Why 1914?"
I dunno what that question says to any of you, but to me it was asking "Why did WW1 break out in 1914, rather than perhaps 1912 or 1916 or even 1918?" So I wrote a lengthy dissertation on that line of reasoning and, considering that History is not my best (or even second or third best) subject, I thought I had done fairly well. Imagine my chagrine, then, when I got my exam back with no comments, just my grade: "F."
Okay, I know I'm not a History major, but it wasn't that bad. So I made an appointment with the professor and, when I entered his den of iniquity, I sat down and asked why I had received an "F."
"Because you didn't answer the question," he said.
"Yes I did," said I.
"No you didn't. I wanted to know why we had World war 1."
I then pointed out that perhaps that what he wanted to know, but that that was not what he had asked. Once I explained my understanding of his question, he got a classic deer-in-headlights look and mumbled something about, "Um ... oh."
So he took my exam back, re-read it, and gave me a C.
Idiot. Naturally, he had tenure.