The third installment of the V/H/S horror-anthology series has just one decent segment in it. And by “decent,” I mean unhealthy and outrageous and fantastically bizarre. Like its predecessors, V/H/S: Viral rolls out spooky stories that appear to be found footage. Therefore, as with most examples of this form, we see many laborious reasons for scenes to be captured on security cameras and the like. Anyway. The movie overall is strictly for cultists, but the one good segment suggests a filmmaker ready to burst.