[mooby]

You won't ever have a problem with the people who work at McDonalds if you follow the simple philosophy of never messing with people who make your food. Yes I know this mostly applies to the actual sit down restaurant industry and not so much fast food itself, but whose to say if you piss off a McDonalds cashier that he won't go to the person making your food and convincing them to give you a "special order"? Just don't do it. Problem solved.