I loved this because Arthur, when he and Merlin are alone together, always throws stuff at Merlin or teases him. But when Uther walked in it was like, "Oops! We were acting like two little boys and Daddy caught us." xD
I'm going to say this is a "What?! Why?!!" Moment because as a parent, I now know that when, or at least when I say don't talk back, is because children should have respect for what we decide as parents. And especially middle school children LOVE to argue and try and negotiate/"prove wrong"/ or point out the unjust. Dude, no. Don't talk back. You got yourself in this mess. Shut it, and take responsibility. End rant.