OK.
I was 12, and doing well, except that in PE and Games I was useless and idle. The PE teacher taught other subjects, but I was not in his class for them. My father was a retired teacher, because of his health, and knew some of the teachers at my school through Labour/NUT contacts.
So my report was good except that this chap had written He has wasted all his time and too much of mine.
And at the first gym period of the new term he walked into the changing rooms and asked [Name], what did I put on your report? and I repeated it, to uneasy laughter at my expense; uneasy because the other boys knew they should not be hearing this.
And what did your father say?
Chance of a lifetime. I told him. He said you are right, Sir, games are a waste of the time of intelligent children and half-intelligent teachers, and as for you, you should stick to history, he'd heard you were adequate at that.
A moment's silence then laughter, on and on and on, not at all uneasy and entirely at his expense, and he had to join in and pretend he thought it was funny!