Isn't it always the case? Your kids want the one thing you don't want them to want??
In this case we have about 5 different sets of cars from the movie Cars. Four of the sets are big enough to not pose a choking hazard to Owen, 1 set is teeny. REALLY teeny. That is the only one Owen wants to play with.
He hasn't ever put them in his mouth, but I only let him play with them while I am right there. He LOVES the squinkies.