Toddler questions

When do kids start asking questions that are actually meaningful? Like last night, when Max wanted ice cream.

The conversation went something like this:

M: Daddy, I want some ice cream (politely, soft voice)
D: In a few minutes Max
M: I want ice cream (whimpery and disappointed)
D: In a few minutes
M: Daddy, I want some ice cream now! (Loud and angry)

It finally ended wtih me telling Max that daddy was asking you nicely to wait a few minutes. (Forget teaching toddlers about time, patience and waiting). Max than proceeded to say, "I need to get my jammies on", I said, "ok, great!" I changed his him into jammies and he got his ice cream.
Max will ask all the questions in the world like, "can I mommy" with no real importance. It might be because he wants to throw the ball, or put a toy back in the bin. But, when we wants something he demands it. So much for being polite!

My favorite question and one I can't resist laughing to (and quite honestly, I don't know how to answer it).
Max: "Can I play with my peepee, can I mommy?"