“FUBAR” (** out of four) was a mildly amusing comedy set in England in which a group of friends (Mark Heap, Sean Verey, Danny Kirrane, and others) go on a mock-zombie survival weekend in the wilderness but a series of complicated and contrived events leave them fighting for their lives as the military soon get involved and think they’re a deadly threat. Likable cast of charismatic unknowns have good chemistry together and wring all the laughs they can out of the thin script but a little of this goes a very long way. Originally titled “Killer Weekend.”