Willie & Korie Robertson almost had a "National Lampoon's Christmas Vacation" moment at their house after a big ball of grease clogged up the septic tank. Uncle Si claims he'd only need one thing to survive on a desert island ... but it has one big drawback. Stone gets the boys talking about how they deal with an upset wife. Si recalls a batch of ice cream that made him sick. John-David and Martin compare the candy at their grandparents' houses. Stone remembers a time his Army training came in handy when he needed to relieve himself in the middle of a lake, and then the boys discuss their strategies for not having any pieces re-emerge. Stone says he wants to get his first Dickies jumpsuit, and the boys all want to help him find the one he should buy, plus the accessories to complete "the look." The boys are shocked to hear Si's unpopular opinion about Shaq-style basketball. The boys laugh at their favorite "Joe Dirt" lines. Martin and Stone give advice for what a new girlfriend should cook for her boyfriend's family. And who has the better cornbread: Lisa or Missy? --- Learn more about your ad choices. Visit megaphone.fm/adchoices