Not true that "trick or treat" was unknown, Boab, although it was never called that I grant you, but the principle was the same.It was a common prank at Halloween in the Highlands to remove gates from their hinges and hide them, and also to attach stones to window frames with a piece of string, hide behind a bush, and tap them gently on the window pane with a long piece of string, to get the inhabitant annoyed.
I cringe as I remember ........but yes, we dooked for apples too, and did the treacle scone thing.
Murray