Things I have said recently which were entirely appropriate in context:
No, I will not get you cash from the bank. You are only 4. (Catherine than asked "Later?" So I said, "Yes, later ... when you are 20."
I am not pulling the car over to pick up your sippy cup.
The moon looks tiny to you, but it is really far away. Trust me.
Do not stand on top of the dollhouse.
Do not put stickers in your juice.