First time I've seen these one. A local Popeye's chicken franchise has a sign that says "Pay Less With Cash". It goes on to say that all transactions $5.00 or more will have a 57 cent "Electronic Funds" fee added to the total bill. If you pay with cash, you will receive a 60 cent discount on your purchase. Thus, if your original bill before this fee is $10.00, and they add the 57 cents, they tell you your total is $10.57 everytime. If you pay cash, your final bill will be $9.97.
They never ask you what your payment type is during the order. The total always includes 57 cents (as long as the original bill reaches $5.00. The times I have paid cash, I did get a 60 cent discount.