I go to this nice restaurant for take-out. New cashier, meal is $18.25, hand her a 20 while I'm reaching in my pocket for a quarter, she's rang up the 20. I said I have a quarter, and looking me straight in the eyes, I can't take that, I've already put the 20 in and it tells me to give back $1. 75 cents. I was stunned that time. So, the next time I went, an the same thing started, I stopped her, and told her that my cash register tells me not to tip anymore if she doesn't know how to make correct change without depending on the cash reg.. She has even learned to count it back to me!