the film 's length becomes a part of its fun 
(ROOT (S (NP (NP (DT the) (NN film) (POS 's)) (NN length)) (VP (VBZ becomes) (NP (NP (DT a) (NN part)) (PP (IN of) (NP (PRP$ its) (NN fun)))))))
(ROOT (S (NP (NP (DT ) (NN ) (POS )) (NN )) (VP (VBZ ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (NN )))))))