Give me one good reason

After a long day outside the kids came in adorned with black finger nails, a tell tale sign that it was a good day.  It's also a dead giveaway that a bath is in their near future. 

They love the tub but it can also be a battlefield of sorts.  It's either a lovely experience or one in which they decide to argue and splash and get in one another's space.  Today was rather lovely.  Both littles played gleefully amongst the warm bubbly suds and their mama just allowed them to self entertain.  It finally happened, as it usually does....

"Hey give that back!  Collin has my tooooooooy!"  

She then splashes him with a face full of bubbles.  Why does it always have to end this way?!

Alright, pull the plug we're getting out!

Why mommy?

Because it's time to get out.

Why?  Give me one good reason why.

I have to insert that he was in no way trying to be disrespectful, but rather simply grasping for an answer to a question he found to be very valid.  

I do not think I have ever said the above... give me one good reason why... which leads me to question where does this kid come up with this stuff?!