When cashiers do this

In some cultures its rude to put the change in the customers hands.

I used to be a banker and frankly, I just didn't want to touch your hands. I don't know where they've been, and that's saying something because money is filthy.

the opposite is also true. when you have an open hand and the customer just throws his money at you.

That's what happened when you have weird currency..

Or when you're waiting patiently for a customer to give exact change and they put it on the conveyor belt -__-

Why is the star trek symbol on your money?

I've sometimes put the change on the counter instead of the hand because I'm trying to multi-task. I know where the counter is, I'm not always sure where your hand is going to be. I may not even be facing near you or focused on you. As a cashier, we have allot to handle and we're supposed to do it in as little time as possible. We're not being rude or inconsiderate, we're just being fast & efficient. Sorry it offends you.