Mommy is always wrong

So I hear a door opening, slamming, opening, slamming - gets annoying pretty quickly.
Me: Whoever is slamming that door, stop it now!
9 year old: It's not me...
4 year old: It's not me...
Continued slamming.
Me: Stop it, now, or else!
Two more "not me's".
Me, to the 4 year old: Well, the sound is coming from where you are, so it must be you.
4 year old: Well, I not slamming it, I opening and closing it.

So there!