the film operates nicely off the element of surprise 
(ROOT (S (NP (DT the) (NN film)) (VP (VBZ operates) (ADVP (RB nicely)) (PP (IN off) (NP (NP (DT the) (NN element)) (PP (IN of) (NP (NN surprise))))))))
(ROOT (S (NP (DT ) (NN )) (VP (VBZ ) (ADVP (RB )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ))))))))