However as i'm sure you realize, the point i was making that people that have not been exposed specifically to newtonian mechanics would not come up with this way even when they use their common sense as much as they want. Both "swimming through the air" and "making yourself sneeze" are vastly more inefficient than even using some of the clothes you're wearing for throwing/pushing away. (yes i know the sneezing wasn't your idea, but it being brought up kind of makes my point).
You also did not answer my question, i wasn't asking whether you would find a way (knowing that you know at least some physics i was sure you'd come up with something), the question i asked was "if you give this problem to the public at large, how many do you think would come up with it"?
So the question really is, is common sense by itself enough without having been exposed at least once to an analytical (mathematical) "toolbox" relevant to the problem at hand? My question was intended to show that the answer is no. So if you rely on your common sense to make a statement as to the big-bang as related to an infinite universe without having gone through the math at least once, why would you expect your common sense on that matter to provide you with more than the common sense of people never having been exposed to conservation of momentum would get them in getting of the ice?