This roller-coaster spinoff of Forgetting Sarah Marshall often feels as if it'll jump the tracks and smash to the ground in a thousand pieces of what-in-the-fuck. It's a complete and utter mess from the big-loud-dumb start to the awwww-that's-so-sweet finish, less a narrative than a loosely-stitched-together hodgepodge of scenes starring the same characters as they hurl toward the titular venue but not before making myriad soused and sentimental pit stops along the way in London, New York, and Las Vegas—all in three days' time, tops. Which is not to suggest that it's not entertaining—far from it. In fact, it's quite the amiable mess and it's occasionally uproarious, mostly due to Russell Brand reprising his role as Aldous Snow, frontman for Infant Sorrow, a sort of Spinal Tap redux. Jonah Hill plays the lower-rung record-label lackey who pitches an Infant Sorrow comeback concert to his boss, Sergio (Sean Combs, never more Puff Daddy than here), and is charged with getting an off-the-wagon Aldous to the show. Hill isn't reprising his Marshall role—the Hawaiian resort waiter with the creepy crush on Aldous—but a tempered version of said role (and, consequently, most of Hill's stable of outsize characters). Judd Apatow produced—and can't you smell the man-on-man love affair?