How far do we sink ‘em? Week 2 of the NFL season was filled to the brim with classic, offensive showdowns and devastating collapses. This year, week 2 can lay claim to at least three different stunning comebacks that will be remembered by all who watched them. Week 2’s slate of comeback victories were so noteworthy that it gave many fans across the internet pause about whether or not a three-score deficit was “truly insurmountable.” Week 2 was historic because it changed what many thought was possible in a football game. But, for the Houston Texans, week 2 was all…