Hah, this thread is my life. You know that Futurama joke "technically correct is the best kind of correct"? That is my 5yo. He is frequently pedantic and needs to know the precise meaning of every new word he hears.
At this point it's close to talking to an adult when you talk to him, so, as others have pointed out, we have to really watch ourselves in terms of letting that make us think that his actual emotional understanding or self-control is more developed than it is. I still fall into that trap quite frequently.
