Hit this one up quick before they fix it. Basically, go to a McD's with a touchscreen ordering kiosk, order 10 regular hamburgers with _no meat_, and order one more that's regular. Each of those burgers with no meat takes 10 cents more off the price than it actually costs, which pays for the 11th burger. Nothing to worry about, if they fix it you can always cancel the order and walk away if there's a balance you have to pay at the end. You're not even dealing with a person.