"My best friend"

The other morning, Aaron woke up to find Matt up again playing in his room. Aaron joined him and out of the blue Matt says "your my best friend" Daddy melted! He gave him a big hug and Matt realized that this was a good thing. So now we have both heard it a few times, sometimes in tense moments, Matt hoping to be cute enough to help us forget the wrongdoing, haha! Still not sure where he learned this but we love hearing it. Hope he thinks that for a long time!