Defiance...at 9 months old

There are only 2 things in the house that Rylan can reach that he is not allowed to play with - the dog bowls and the DVD player. Guess what his two favorite toys are?!? He'll look at me, grin, and then sprint (well, crawl quickly) towards one of them. Once he reaches it, he'll turn and wait for me to say NO and then grin happily at me. What does this mean for us when he's 16???