I must have been about 8 yrs old. Morning playtime, and as a very shy child I was hit in the head by a cricket ball being hit for six.
The male teacher who played/taught cricket to the boys , Mr Porter, had an impromptu game of cricket with them.
The ball hit me in the forehead, just above the eyes and the force knocked me backwards over a knee-high wall.
I was dazed but so shy I hated any attention, rarely spoke and would never make a fuss.
The teacher came over, but as I'd stood up again, dismissed me with a " You're fine" comment and went and resumed his game.
Imagine that today! There'd be an ambulance, hospital check, health and safety issues, forms to fill, parents to be told, records made.
A huge black mound rose on my forehead, a bump which stayed there for weeks or more, until bruising and swelling subsided. I remember my head throbbing for ages afterwards.
I also remember my Mum giving me hot milk, honey and aspirin every night for about a fortnight and boiling the kettle and making warm compresses with the tea towel to hold on my head. .
No frozen food in the house then, so no ice packs available.
I can still see the face of that callous teacher staring at me.
That head injury may well explain a lot about the way I am today. 
Well, that's my excuse! 