Cole & Kira - Constantly Entertaining Us

So, yesterday at the Circus Kira grabs some popcorn and holds it up to Cole's mouth.  When he leans over to take a bite she grabs it back away from him and starts giggling hysterically.  Where did she learn this?!  So Cole, luckily, also finds it hysterical and they do it about a gazillion more times.  Then this morning I hear Cole tell Delia a story when she arrives - he says, "Daddy told me that there were going to be doggies at the circus but we didn't see any.  I think he was just faking me out."  ????? Where did he hear the term "faking me out"???  These kids are like sponges - watching and listening to everything we do and then surprising us with their new knowledge!  Too funny!