The wondrous mind of five

Me: "You're SO big!"
Him: "Yup!"
Me: "How did you get so big? I wasn't looking."
Him: "It's because I ate TWO mustard-and-cheese sandwiches."
Me: "Oh, really?"
Him: "Yes, they were adult-sized sandwiches so I had to get bigger to fit them both in."
Soon, I think, he won't fit in my lap anymore.