I've got a few key phrases that are handy for answering "why?" especially when I'm in the car in peak-hour traffic.
* Why do you think that is?
* Because I said so.
* Because it is.
* Why not?
Questions tend to be a more effective response than anything else, as it requires her to think of an answer herself. And if she's busy answering me, she's not asking me another "why?"
