To say that the “South Park: The Complete Fifth Season” DVD set is loaded with classic episodes is kind of pointless because, to be honest, the same can be said of virtually every “South Park” season. Still, creators Trey Parker and Matt Stone knocked one episode out of the park after another in this fifth season by introducing several memorable new characters (Jimmy and Towelie), killing off one of the show’s mainstays (Kenny), swinging the spotlight onto another fan favorite (Butters) and, of course, announcing to the world that Osama Bin Laden had farty pants.