If - Then

Jaedon has stumbled into a grand new phase of understanding cause and effect - the whole "if - then" idea. I guess I must speak to him in cause and effect quite often because over the past few days he has decided to speak to Brad and I in the same way. For example - before breakfast today he asked if he could have a piece of candy (thank the LORD there is only two more pieces of Halloween candy left!). I told him he could have one piece of candy after we ate some breakfast. He said "well, if you're not gunna let me have a piece of candy now then I'm not going to eat my breakfast." I replied "If you're not going to eat your breakfast then you're not going to get a piece of candy!" The dialogue continued by him saying "well, if I can't have a piece of candy then I'm gonna pitch a fit!" AH!! Where should the bantering STOP!!? I told him that if he chose to pitch a fit that he could go in his room while Seth and I enjoy our breakfast. I'm not sure if I should just keep reasoning with him - he seems to "get" the reasoning logic thing- or if there is a better way to be dealing with this defiance. Any suggestions?!