I believe that one turned up with a US Presidential candidate.
There was an incredibly fearsome maths teacher at my secondary school - quite the "character" but actually okay in classes.
He once gave us a maths test (this be what I'd call my first year) and he got an answer wrong. NONE of us dared challenge him, so I only got 19 out of 20 in that test - well, it was 20 but you know where I'm coming from.