Gideon for a while, when he gives us a “hi-five”, has always proceeded to give us “knuckles”.  We started doing that after the movie, Big Hero 6.  Today, he gave me a hi-five after he did something, and I turned away, and he actually told me, “knuckles” while he was standing there waiting for me to give him knuckles.  He said it pretty clear too.  Very exciting to see the words keep coming and coming.