The worst ever, was when our usual PE master was on leave, and we got this red-haired, bearded Scottish maniac for a term.
I was 13 or 14 then.
This chap was certifiable!
He would haunt the change rooms and the adjoining showers like a restless ghost, full of ‘boys together’ heartiness.
He would sneak up behind you when you were in the showers, or getting in or out of your underpants, and give you the most almighty smack on your bare bum, enough to make you jump out of your skin.
“Ye shouldna have sich a bonny wee bummy to smack now should ye, sonny boy?!!” he’d shout, leering at you.