What kind of brain do you have?

This past Friday Zachary went to see his Doctor for social skills training. While we were in Dr. Lundy's office Miss. Isabella was in the room with Zachary and Dr. Lundy. When it was time for Zachary's appointment Dr. Lundy said, "Ok mom and Isabella we will see in a while." I reached for Isabella's hand and she turned to me and said, "Bye mom." I said, "Isabella it is time for us to leave." She again said, "Bye Mom." All of the sudden Zachary looked at Dr. Lundy and I and said, "Mom Isabella has rock brain and she needs to go and find super flex." I said, "Zachary what is rock brain?" He said, "Rock brain is something that happens to you when you keep getting stuck on the same idea over and over again and super flex comes in and tells your brain it is time to be flexible." I said, Who taught you about rock brain?" He said, " I learned it during social skills group at school." Needless to say, I had never heard him use these terms before, but I had noticed during the past couple of months Zachary was becoming more flexible in his thinking. I then thought to myself those are pretty good visual terms. I then questioned how frequently I had rock brain? And once I was able to answer my question I thought I could use more super flex too!