Scooby-Doo...um ok?!

Ok today Connor and I were in the kitchen, he was sitting at the table and I was finishing putting the food for dinner out and the doorbell rings. I look up puzzled wondering who it could be and Connor looks at me seriously and says, "It better not be Scooby-Doo!" and gets up and marches out to answer the door. I just watched his retreating figure and laughed, he was so serious when he said that...where the heck did that come from?