WHY ? ? ? ? ?

I've always heard stories of kids getting to their "why" stage, but to me it never seemed like it would be that big of a deal.  I'm starting to understand.  Presley's thing is to ask why, then follow it up with a "why (insert what you just said here)."  Here are two normal conversations Presley and I had on Wednesday:

P1:  Why did Mommy get a new car?
Me:  Because her car is in the shop.
P1:  Why is it in the shop?
Me:  Because we are getting the air conditioner fixed.
P1:  Why are you getting the air conditioner fixed?
Me:  Because it's broken.
P1:  Why is it broken?
Me:  Because it stopped working.
P1:  Why did it stop working?
Me:  Because sometimes things just stop working.
P1:  Why sometimes things just stop working?
Me:  Because they just do.
P1:  Why do they just do?

Later that day while at the doctor's office:

P1:  Why is there not a movie on?
Me:  Because it is turned off.
P1:  Why is it turned off?
Me:  Because they didn't turn it on.
P1:  Why didn't they turn it on?
Me:  I don't know Presley.
P1:  Why don't you know?
Me:  Because I don't work here.
P1:  Why don't you work here?