Run attached file in Android, click the fly in/out box. The box animates off the bottom of the screen and keeps going until you click the screen. It will then animate back to its original location. Depending on how long you wait to click, it might have moved a long way off the screen and take a while to return. If you don't click, it apparently just keeps going south.
Bug existed at least in 1.7.5 and probably earlier. Confirmed it still exists in 126.96.36.199RC.
Works fine on iOS.
This is a lab example from the Advanced course.