Sometimes what I like to do, is if I am at a store and buy something that totals say $6.00, instead of paying with a ten and get four singles back, I will give them a ten and a single ( to get a five back ). it confuses the heck out of them. Although you need to be sure they know what you give them, In this example they might just glance and think you gave them a five and a single. then you might end up arguing, and possibly being out a five dollar bill.
Sad to say that most younger cashiers depend on the cash register to tell them the correct change to pay back, because they can't figure it out in their head.

Last edited by oldhunter49; 04/30/22.