BatDad encourages son to practice karate, ends with a telling off

BatDad's son is on his way to fight crime too - maybe once he figures out how to break the wooden board.
His son Ben has been taking karate lessons, and when he told his dad that he learnt how to break wooden boards, BatDad couldn't be more proud.
However, he wanted to practice on bigger things, like full sized wooden beams. 
But it could be a bit too soon for that as his attempts at home only led to a bit too much frustration that Dad did not condone.