Seriously? The “Real Housewives of Atlanta” cameras captured Porsha Stewart’s crumbling marriage and messy divorce from her pro-football hubby, Kordell Stewart, but on Sunday night’s episode the reality show caught Porsha’s most cringe-worthy moment yet. As the ladies of the Bravo show headed on a Freedom Trail tour in Savannah, Stewart revealed that she thought the Underground Railroad was a real, physical train. Yikes.