Related to the petrol station one – when you’re in a queue at the checkouts and the person in front of you is told the price. And only then to they start to wonder where the **** they put their purse, rummaging round in the 74 pockets of their “organiser” handbag, their coat and eventually finding it and then counting out the spare bits of change.
Hand over £10 note and then, 3 seconds after the cashier has typed in “£10.00” and got the correct change displaying on the screen, they triumphantly hold out their hand saying “oh, I’ve got the 23p, does that help?”
No it **** doesn’t! Now you’ve confused the cashier and added an extra minute of delay to the whole transaction which would have been over in 5 seconds if you’d had your contactless card to hand when you should have!