in days gone by, you could attempt to shake the bottle up enough so as to not be able to differentiate the cream from the milk, but in the world of real things, the moment you stopped shaking the bottle, the cream would start to separate....oh, it might have taken a while depending of the degree of shaking...if they didn't know better, a lot of people might have started to honestly believe that cream was just pre-shaken milk, but over time it would gradually dawn on people that milk and cream are not the same thing, because if they were , you wouldn't have had to keep shaking the bottle to not be able to tell them apart......