I used to go to fast food restaurants on a regular basis. Sometimes my order got mixed up and sometimes it didn't.
For those occasions that it got mixed up--I usually asked for them to fix it with a smile.
Now a days--I don't go out to fast food restaurants often as I am opting to eat at home. When I do go out to a fast food restaurant--I usually end up with a gastrointestinal fiestas.....