I ran across a bug in an Android app that I was working on that had me throwing the phone to the floor multiple times in frustration. I finally tracked the problem down to SurfaceHolder.Callback.surfaceChanged() being called twice when the phone is held vertically, but only once when the phone is held sideways. Everyone using the app holds the phone sideways when using the app because the text and icons are all sideways. However, I had said to myself, "Screw that. I'm not going to turn the phone sideways just for that." I don't know what the proper way to fix it is, since I don't know why the code is in SurfaceHolder.Callback.surfaceChanged(), and the person who wrote it had just moved on to another company (Google, actually) a week earlier.