When my triplets were 4yrs old I had one that went through the "why" phase.
Anyways...were taking a two week camping trip up north and after a week we had to run into nearby town fill up with food and gas and go back to our camping spot. During our trip down, Neshay was asking her dad a whole bunch of questions that started with "Why....why...why".
Anyways.... she had asked a question ( I forgot what the question was) and her dad's responce was " I don't know...Neshay."
THere was a pause....then she asked "Dad....why don't you know anything?"
I had to turn my head away....and giggle. Let the dad debate that one out.