What is a Hamburger?!?

Apparently its just me, but when I go to a restaurant and ask for a hamburger, that means that I do not want cheese on it. If I wanted cheese on it then I'd ask for a cheeseburger. What are the practical implications of this? Simple. My son is allergic to dairy products. I'm not talking lactose intolerance, I'm talking about full-blown allergies. Tonight we went through the drive thru at Dairy Queen and I asked for a hamburger for the boys to split. Apparently DQ does not agree with my distinction between hamburgers and cheeseburgers. Guess I'll have to start explaining the difference between to the people at DQ.