查找谁对某个对象有保留计数

I have a UIViewController which has a retainCount of 3 the moment I instantiate it. That stirs me as terribly incorrect. What's the best way of figuring out who bumped up the retainCount to 3? I'd imagine instantiating the object should give the pointer 1, then I suppose maybe pushing it onto the UINavigationController's stack might bump it up one (not sure about that though?), but the third.. is a mystery. I have a UIViewController which has a retainCou