Be honest. How many of us have said that to our children? I must admit, I have said that on more than one occasion. My son asks "Why?" all the time! And yes, when I am exhausted or tired of answering the question, I just sass back, "Because I said so!"
Let me be the first to confess, that is probably the worst thing I can say to my son. His impressionable mind, just soaking up all the knowledge he can, wants to investigate every thing that exists, including my thoughts and my actions. I should be celebrating his inquisitiveness rather than dismissing his curiosity. I want to encourage that kind of critical thinking and help him understand what it is he is observing. After all, he is going to be just like me. I might as well let him know why!