On a list of stupid things about "that episode," the how'd they attach those chains? ranks way, way, way lower than things like where'd those chains come from? and how'd Jon pull himself out of that icy water? and Uncle Benjen WTF? and Gendry/ravens must be really fast.
Dumbest episode of the entire series? Probably. At least tied with the Arya/Waif showdown.