title: Why am I crashing after MKMapView is freed if I'm no longer using it?
body: <p>I have a <code>MKMapView</code>. Sometimes after my view controller is dismissed, I'll get a <code>EXC_BAD_ACCESS</code>.</p>
  
  <p>I turned on <code>NSSZombies</code> and it looks like the <code>MKMapView</code>'s delegate — my view controller! — is being called, despite both the <code>MKMapView</code> and <code>UIViewController</code> subclass being freed. I've checked, and my memory management is correct.</p>
  
  <p>What's going on?</p>