I clearly remember thinking 'what?" whenever the teacher mentioned "The Apparatus" during PE.
I didn't know what apparatus was! This was in primary school. She'd shout to the group of us in the 'big hall' "Don't touch the apparatus!" during the times when we were allowed to run around aimlessly during "PE lessons"
Then there was the mysterious "Cloakroom" I couldn't work out if this was a euphemism for toilets or if they meant the tiny bit of the corridor where we hung our coats.
Still not sure. Was I a lone weirdo who didn't understand basic stuff?