Yeah I guess thinking about it I sometimes put paper bills on the counter. But it's more so that I can start finding the right coins without delaying the process. The coins though, I always wait for them to hold out a hand.

What drives me nuts also is- as a customer, when someone puts change in your hand and it's coins on top of the bills so that the coins slide off.

But when I spent time in Korea, I learned it was extremely rude and demeaning to hand people the cash directly. They sometimes have special little plates for the exchange to occur. I think because the gesture of holding your hand out is associated with begging.