me too, as a customer I frequently hand over seemingly strange amounts of change on top of a few dollars; goal: enhance the number of quarters I get back for parking meters
I remember this skill being slowly lost as I grew up in the US - then I moved to Germany where grocery store cashiers would specifically ask for extra cents to get simpler change. And now with digital payments on the rise I get to watch it slowly be lost a second time.
I felt busted the first time I saw this.