Literally A Clean Slate

This is an incident which Luke provides anecdotal support to B.F. Skinner and behaviorists alike.

My in-laws are here and Luke is having a ball of a time, especially with Papa Fred, who is a goof ball to the last chromosome in his DNA. A few days ago, they had the following conversation:

Papa: (Knocking on Luke's head) You got any brains in there?
Luke: (Not knowing what "brains" are and surmising that it's probably something undesirable, such as poop) Noooooooooooooooooooo! I don't have any brains! I've got no brains in there!

There you have it. A kid whose mind is empty as a clean slate, and he's 4!

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In related to being brainy (or not), Papa has also taught Luke the random saying, "Wise guy, eh?" (As of the purpose of Papa teaching Luke such saying, I know not.) So one day at the lunch table,

Luke: We are all wise guys. I am a wise guy, Papa is a wise guy, mama is a wise guy, and daddy is a wise guy!