Of the myriad parallel chases randomly meandering throughout Panini America's 2016 Donruss Football, perhaps none is more perplexing than the mysterious Aqueous Test parallel. If the high-sheen fronts don't stand out at first glance, the unmistakable backs -- emblazoned with a prominent "AQUEOUS TEST" stamp running diagonally from the top left corner to the bottom right corner -- certainly do.…