Don't worry. I can remember when a local coin phone call cost 5 cents and I think the coke machine did also? And people would rock and/or tip it to get a free one!
Occasionally wonder if we should start a collection of these 'expressions' and 'slang terms' ................ hard to think of them cold. But quite often, probably in my case a sign of age; they come to mind or pop into conversation!
Let's see:
From the UK. "Spending a penny" .............. meaning going into a public convenience to use the toilet which then cost exactly one British penny, one twelfth of a shilling or one 240th of a UK pound.
"A month of Sundays" ........................... meaning very slowly or never!
"Would you believe .......................... ", meaning; not really.
Lots more; but right now can't think of them! :-)