If you eat at a restaurant with an actual chef in the kitchen you can ask for a custom order and they'll try to get it right, but people who go out to fast food restaurants and ask for custom orders are asking for trouble.
That's because the folks preparing your food don't take kindly to custom orders, and they show it by going the extra mile in the wrong direction.
Ask for extra mayo at some places and you'll get a sandwich that's drowned in the stuff, ask for "sour cream on the side" and that's literally what you'll get.
See Food Orders That Were Totally And Hilariously Misunderstood here
We dish up more neat food posts at the Neatolicious blog