Why?

The simple question "why?" is, in itself, so harmless but when you hear it 500 times a day it is no longer harmless. I am about ready to wipe the word "why" out of the English language and every other language that my daughter could learn!!! It doesn't matter what I have said to her, the response is always, "why?". I can say, "do you understand?" and she says, "why?"!!! I have now resorted to the universal parental phrase "because I said so!". When she is being particularly cute my daughter says, "why do I say why all the time?". I know this is a stage that all kids go through but not having been through it before I am shocked at how often one word can be used in a day.