I just thought of something, imagine this scenario: You have an empty bottle of sode\water(whatever) and you hold it lopsided, at the point where it theoretically would stand still. But then move the top half a millimeter towards the center, and then release it. Then it will "fall" to the center and then tip over to the other side. In my mind, it should be falling to the excact same place on the other side, (ignoring other forces than cinetic energy's proportion with stationary energy) and then tip back to the originally place and then do this infinite numbers of time. Including other forces, it will fall slightly less to the opposite side each time it "falls". BUT, the question is: I have released a bottle like how i said, and it fell over on the other side! The energy that is "gained" from the trip to the center should exceed the energy needed to tip over to the opposite side! What is this, and why does it happen?