The new trailer for Mud starts out as a good-time tale of two boys exploring, then it gets dark (and not just because Matthew Mcconaughey shows up). In fairness to McConaughey, when this film made its film festival debut at the prestigious Cannes event last year, the hit and miss actor was widely praised for his performance. McConaughey plays the title character of the film, a fugitive who the boys bump into on their explorations, the three of them ending up on a tense emotional journey together. But does the trailer give us any clues as to what that might be?