I work on a very popular app in Latin America. That means we get to experience every single edge case in the eco system. My favorite quirk has been that for some reason I will never understand when an app goes into a full screen ad it can make your main activity eligible for GC. That means that you don't get any of your Activity life cycle events. Just a lone finalize and your app is gone. Then when the video ad is done you get a truly spectacular crash!

Sadly, I have a half dozen different ways activities have found to explode themselves. It makes me sad!