Should I Expect Union Organizing Next?

My 5 yr old son has been ... "displaying his independence" lately. So the other night I told him to go pick up the toys he left scattered in the living room. He looked at me defiantly and did not budge from his stance in the kitchen. In fact, he basically stared at me to see what I was going to do next. Clearly this was a test of wills going on - a battle of epic proportions you might even say. I repeated the instruction more firmly. Again, no action from him. Finally I asked "Are you not going to do what I tell you?" my voice beginning to get the irritated-mom ring to it. This would normally be a warning to him that he better get his butt in gear before he gets his butt swatted. His response floored me into complete shock. "What are you going to do, fire me?" he retorted, with a bit of that smirk he's come to perfect.
I seriously didn't know whether to be angry or fall out with laughter. I mean, I have no clue where this came from. Never once have we had discussions about people being fired/losing their jobs/etc. I know he is very perceptive and picks up a lot from conversations he hears around him, but this was completely out in left field. I was actually somewhat impressed with his correct usage of the term in the proper context of the situation. Of course, I didn't let him know that at the time.
When I responded with "Fire you? No, I'm not going to fire you," he finally got the drift that he was skating on thin ice. He laughed heartily. "I'm just kidding, mama. It was a joke." Then he trundled off to pick up his toys.
As soon as the coast was clear, I rushed to share the story with my husband. We both had a good laugh about it and shook our heads in wonder.
I know this is just a glimpse of what my future holds with my son. He's always been a "negotiator". He's very intelligent and understands concepts quickly and knows how to apply past practice to a future scenario. If you try to change the "rules" on him, he'll call you on it every time. For example, while driving in the car one night several months ago he asked if we could get some candy at the store. My husband and I both responded "Maybe" and "We'll see". When we didn't end up getting candy, Jackson broke down in tears. We asked him why he was crying and he responded that we didn't get candy. My husband reminded him that we didn't say we were getting candy. To which Jack replied that we said "maybe" and "maybe" always meant yes before. Upon thinking about that statement, my husband and I acknowledged to each other that Jack was right in his observation. We were changing the rule that we had inadvertently created by always turning "maybe" into "yes". Needless to say, we are much more careful now. And this is just one of many many situations where he has remember a conversation/concept/situation/etc and correctly used that information to address some action he was currently facing and address it in a way that seems well above a 5 year old emotional/intellectual maturity level.
I'm eager and a bit apprehensive to see what my teenage boy will level at me during our conversational sparring matches.