VIDEO : 'Happytime Murders' R-Rated Puppets Can't Save One-Joke Movie

Jim Henson was best known for the Muppets, but he wasn't above bringing more adult flavor to his string-and-yarn creations. His son, Brian Henson, takes the idea to R-rated extremes with "The Happytime Murders," a movie that quickly unravels -- agonizingly stretches about five minutes worth of gleefully crude fun over a pretty excruciating 90 minutes.