“From the mind that brought you Spring Breakers” should really be all you need to know about the first trailer for The Beach Bum. The latest outsider odyssey from Harmony Korine stars Matthew McConaughey as the eponymous beach bum — a guy named Moondog whose entire wardrobe seemingly consists of clothing scavenged from the dumpsters of David Lee Roth and Guy Fieri, and who is, he says, a poet from another dimension.