I was just watching TWOK. To me, the scene when Bones is telling Kirk to get back his command. He's almost "commanding" him to do it. To me it's one of the best scenes in Trek because it's not an earth-shattering scene, not an action scene, not really monumental in any way. But it shows how extremely close these two guys are. Bones comes in and sprawls out on the chair in front of the fireplace, fussing at his friend in a loving way - really like he's a big brother to Kirk beyond just being a friend and colleague. And DeForest plays it so well.