I understand the question may have been closed in great haste, but you need to understand that this question isn't constructive for the reasons I posted in that comment.  Any modern computer manufacturer has to build their components up to the specification and licensing of the country they're sold in.  And indeed, all of North America ([FCC][1]/[CSA][2]) and Europe ([CE][3]) do have standards in place for this sort of thing, **especially** for devices which are going to be plugged into the wall.

It doesn't matter which end you plug into what first, because it doesn't have to - mostly because the devices have to be up to the regulatory safety standards before they can be sold.

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Actually, one last thing just came to mind.  All of this goes out the window if you buy cheap, third-party, unlicensed laptop chargers (or any other device chargers for that matter).  This is a huge safety concern ([ref][4]), for both your device, and more importantly, *for you*.  However, even toching on this manner addresses an entirely different question:  *Is my charger **safe** to use?*  And even in this case, the order you plug what into what is still irrelevant.

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Aside: Since there are possible safety risks involved, do you think it's worth editing the question or an answer so the above three paragraphs can be seen by other users finding this question?


  [1]: http://en.wikipedia.org/wiki/FCC_Declaration_of_Conformity
  [2]: http://www.csa-international.org/certification_marks/
  [3]: http://en.wikipedia.org/wiki/CE_marking
  [4]: http://www.arcfn.com/2012/03/inside-cheap-phone-charger-and-why-you.html