Fast food drive thru windows!?

At fast food restauraunts, instead of calling their drive thru windows, drive thru windows; why don't they call them, "pull around, pay, and pull up and wait for 20 minutes for someone to bring your food out to you".
Update: My point is, your supposed to get your food at the window. That is what makes the fast food restaurant that kind of restaurant. Your not supposed to pull up, let your car overheat for 20 minutes and wait for them to bring it out to you.
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