title: iOS: how to trigger a user force-quit crash on iPhone?
body: <p>WWDC video(WWDC 2010 Session 317 - Understanding Crash Reports on iPhone OS) says error code 0xdeadfa11 in crash log means a user force-quit crash, but I've never seen this errer code.
  How to trigger a user force-quit crash?</p>
  
  <p>EDIT:
  I would like knowing both the manual way and programmatical way  :P</p>