I do not like hamburgers...

Trey and I have a routine of always reading a story (or two or three) before nap time and bed time. We have read stories enough that he knows the names of most of them. But from time to time we'll read new stories or he just can't remember a title so he will give me a brief description of the story he wants to hear so that I can find that book.
We were standing in front of the bookshelf and I asked him what he wanted to read. He mumbled something about hamburgers. (he was in a mumbly, whiny kind of mood) I told him we didn't have any books about hamburgers. But he said " I don't like hamburgers". "I know you don't like hamburgers" I answered. "Pick out a book."
Again Trey says "I don't like hamburgers!" He's pointing towards the bookshelf but I think he is just stalling, not wanting to take a nap. "Trey!" I said more sternly, "Pick out a book to read or we will go to bed without a story today!"
He inches closer to the book shelf and stands on his tip toes still half-heartedly pointing towards a book. "I DO NOT LIKE HAMBURGERS!!!!" he says using his deep, monster voice. I am getting aggravated with him now. I am sure he knows that we don't have a book about hamburgers, he is just testing me. But he does seem to be trying to reach a particular book so I move closer to try to see which book he is pointing to. He also is getting frustrated with me and is hopping a little to try to be able to grab the book. "I DO NOT LIKE GREEN HAMBURGERS!" he says again very firmly.
Finally it clicked and I laughed as I pulled the book off of the shelf. It was a new book. We had read it for the first time the day before. "Ohhhh, I see." I said, still laughing. "You want to read Green Eggs and Ham". I held the Dr. Suess book out for Trey to see. "Yeah." Trey says quickly, "Green Eggs and Hamburgers". He looks at me kind of silly like he was saying "Gee Mom, I've been trying to tell you this for the past five minutes. What took you so long to figure that out?!?"