'Spontaneous' Review: Katherine Langford's Sci-Fi Comedy Is Bloody Good -- But Mostly Bloody

New Paramount pic Spontaneous, which stars Katherine Langford (Knives Out) and Charlie Plummer (Looking for Alaska), begins with a bang. A big, wet, sloppy, chunky, gooey, meaty bang. You see, a teenage girl explodes in the middle of what would otherwise be just another class in just another day in the fairly routine existence of your average high schooler. But to just spontaneously combust in front of your peers with no warning and no protocol on what to do in the aftermath? Well, that's anythi...