They are taught to ask things like "Would you like fries with that?" or ask about a drink. It boosts sales.
What gets me mad is if you don't want the drink, sometimes they will charge you ala carte instead of meal deal.
I knew that they have been trained a certain way, but sadly, they can't seem to get beyond it. As many times as I went in there, as many times as I told them what I wanted, I still got the same questions.
Even the manager, who was listening in a lot of cases, would do the same thing. some days, it just didn't pay to get up in the morning.