When your 3.5 y.o. asks you to teach him to count from 100 to 200 so that he can learn to count all the way to 1000. I agree (oh but so exhausted) and then I say, "Did you know that not everyone loves numbers?"
DS: "Who? Who are these people?"
Me: "Just some people don't LOVE numbers, they like other stuff."
DS: "Who are these people, can you tell me their names?"
Total disbelief at the possiblity that someone couldn't love the very things that electrify him. Too cute.