To paraphrase Oscar Wilde, "To experience one raging drug-induced blackout may be regarded as a misfortune; to experience two looks like carelessness." And "carelessness" is the operative word in The Hangover Part II, the fairly unnecessary sequel to the sporadically amusing The Hangover. In the first outing, three oddball pals (Bradley Cooper, Ed Helms, and Zach Galifianakis) black out during a bachelor party, forget everything that happened, and then frantically comb Las Vegas for the missing groom. While the story meandered at times, the upsides were memorable: the leads were likeable, the script sneakily mirrored a pulp mystery, and the film was peppered with bizarro dollops of tigers, hookers, and Mike Tyson. Here, we get more of the same.