You know the routine when paying for something at a store: If you use a card of any kind, you have to answer 3-5 questions before the purchase transaction is done.
"Your total is $37.84"
"Do you want cash back?"
"Is $37.84 OK?"
To me, this is the kicker. I just want to yell at the machine NO! No it is not OK that I'm paying over $3 for a gallon of milk. No it is not OK that the loaf of bread is $1.20. No it is not OK that I can fit $37 worth of food into one little grocery sack. No, $37.84 is too high. Can you lower the price a bit?
Instead of yelling "NO!" at the machine, I punch the 'yes' button and get my receipt.