Pesky Customers

I was delivering food one day at sonic to a customer. The individual, who will not be named for i didn't care to want to know an individual who should remove himself from the gene pool, ordered a sonic burger, a coke, and some tater tots. When i get to his car the individual looks at me and says "is that your 44oz drink?". I told him "no sir that isn't our 44oz drink, you have to ask for it if you want our free upgrade." While thinking to myself...."seriously,does it look like a 44oz?". Then he accomplishes himself to even look more like an idiot by saying "well i thought you would just give us the 44oz since it is a free upgrade". My reply to him was "sorry sir, but some people don't want that big of a drink." while thinking "really now...if you want something you ask for it. we aren't psychic." He then tries to go further into his explanation by saying " we'll if they just get the free upgrade they can throw away what they don't want". Keeping my composure, i replied...not wanting to lose my job, " well like i said, some people don't want the big drink" but what i really wanted to say "Moron! people know what they want and ask for it.Next time i will tell the manager to put AT REQUEST for special people like you". Would've been a lot easier if you just said you forgot you wanted the upgrade. Would've saved you from looking like someone who rode the short bus. Oddly enough...he wasn't the first "special" person to do that.......