There is no such thing as an "Arby's"
"In my late teens/early 20s I worked at Arby's. I started as a cashier, then worked my way up to GM. This was 20 years ago.
"In the eight years I worked there, there were COUNTLESS customer-induced horrors. The one constant, however, was the inability of seemingly normal people to just order the food they wanted. Maybe it's just me, but I usually have a general idea of the type of sandwich I want from a fast-food restaurant. If I'm in doubt, I'll read the menu, ask a question, whatever. Generally, I believe what the cashier/server answers. I figure they know what they're talking about.
"Daily, customers came in and ordered an 'Arby's' or 'five Arby's.' There is no sandwich called an 'Arby's,' but since I am not an idiot, I understand context and could usually figure out what they meant. Still, imagine going to McDonald's and ordering a 'McDonald's.'
"The worst was when they'd argue with me: 'I want five Arby's to go. That's all.’ Me: 'OK, will that be the five Arby-Q sandwiches on special for $5? Those are roast beef mixed with BBQ sauce, like a Sloppy Joe; or did you want five regular plain roast beef sandwiches? The regular roast beefs are not on special, though (smile*smile*smile).'