This past Sunday I was teaching the lesson and all of a sudden one of my teen students blurted out, "wait a minute - this lesson... it sorta ties in to the game we were playing in the beginning of class - did you do that on purpose?!" Yep! BtO does not insert games for the sake of games... they all tie in to the message of the day. Thanks for noticing haha.
But that really does tie in to an important point worth highlighting - you have a finite time with your students, so make your curriculum work and whatever you do - do it on purpose.