"No, No, No!"...with a finger shake!

Ryan told me "No!" for the first time today. Enter Rogaine for me as I will now be pulling out my hair! He was throwing things and I told him "No". He looked right at me and said crystal clear, "No, No, No!" and shook his little finger at me. I cracked up....
I know that is the WRONG response but he was so adorable and even used the right inflection. When I started laughing, he laughed too and said it over and over and over.....Oh No! I've created my own monster and he's a foot and 1/2 high...
He put himself on time out today too. He kept crawling on top of the table while my Preschoolers were trying to eat their snack. After the 3rd time of hauling him down I faced him and said, with the firmest voice I could muster, "You need to listen or I am going to put you on time out". He turned around, sat on the time out chair and smiled the cutest smile......GREAT!!! I can tell right away that time out is going to be REALLLLY effective for him as a discipline method.
Terrible 2's are apparently on their way.....groan.