This is exactly the question I have when I have seen these on the menu. How does anyone manage to get the thing into their mouths?
When I was a kid in the early and mid 1960s, the nuns used collect money from each of us in class so that the next day they would go buy McDonald's hamburgers and fries for us to eat. Those hamburgers were small by adult standards, but perfect for a kid's mouth. One thing that stands out that I recall was that these came with both mustard and ketchup and a pickle or two and that was it. Very simple and very inexpensive. I think we only paid around 50 cents to get one hamburger and a little box of fries.
I also recall around that time that my dad, who worked at Lockheed (later became Lockheed/Martin) in Burbank, CA, went out to lunch with co-workers at some restaurant that had fancy burgers. All he did was complain about it because the hamburger cost $3. Now, a burger that is probably not as nice costs around $10-12. He was cost conscious and took a brown bag lunch most days, just as I started doing as prices for lunch became prohibitive.
Really, I don't understand going out for a burger because if we make them at home, it is a lot less expensive and we can pile on whatever we want.
Tony