The playfully titled, deliriously deadpan Kaboom doesn’t so much explode onto the screen as briefly sparkle then fail to ignite. Superficially it’s an intriguing confusion of murder mystery, Generation Sex romp and slacker comedy, and is relentlessly prone to flights of Gregg Araki’s trademark psychedelic fancy. As shag-happy as a teenage boy, with its drugs, witches, cults and cast of nubiles it sounds like fun, right? Unfortunately, for the most part, it’s a bit of a drag.