We at Collider are happy to debut an exclusive clip from writer/director Brian Duffield’s upcoming teen film Spontaneous, which he previously described in our extended interview as a cross between a John Hughes movie and a David Cronenberg movie. Katherine Langford stars as a high school senior named Mara who finds her world thrown into chaos when her fellow students begin inexplicably exploding. As she and her friends struggle to survive in a world where each moment may be their last, she also sparks up an unexpected romance with a young classmate played by Charlie Plummer. In this …