In UK exams, a “No Mention” was basically where you did so badly in an exam that they didn’t bother to mark it, and you weren’t actually listed as ever taking it.
I got a No Mention for my A-Level Special Maths. I got talked into sitting it by my mate Matthew, who is a maths genius. It was on my 18th birthday, my last day at school, and a gorgeous day.
When I opened the exam paper to see proofs of things involving frictionless pulleys and light, inextensible strings, something snapped. I wrote my name, then:
1) I refuse to answer this question on the grounds that it is silly.
I sat for a few minutes, watching the dust motes groove about in the light from the library windows, then walked out.
Matthew got a special distinction, by the way.
I would have liked to add that I went home and listened to “A Can of Bees” by The Soft Boys on my brother’s hi-fi. But I think he’d already left home by then, taking his record collection with him.