Rule Clarification Please

So yesterday Caelleb was "sick" with absolutely no symptoms but I went ahead and let him have the afternoon off from preschool because he kept telling me he was sick. Normally I don't give in but we have had a stressful few weeks as a family so I figured maybe he just needed some extra "mommy" time (side note: when I asked him about that he said, "I need daddy time" -- whatever, :) I'm used to that--he is such a little daddy's boy!). Anyway, so he was with me on my lunch break. I stopped to put gas in the van and told Caelleb I was going in to get a soda. He wanted to go in too because he wanted the "pink juice" (this extra sugary juice that we let him have on occasion, rare occasion). So, trying to make a point that you can't just miss school and do/get whatever you want, I say, "I already have apple juice and water for you in the car and besides when you are sick you don't get to drink that kind of juice." His angry/pouting response: "I didn't know that was the rule!" So, I asked him if he wanted to change his mind about being sick. I could totally just see his little mind working. Once he weighed his options (not sick=juice but going back to school & admiting he hadn't been totally honest vs. sick=no juice) he decided that he was in fact still "sick." Too funny!