pile up , undermining the movie 's reality and stifling its creator 's comic voice 
(ROOT (S (VP (VB pile) (PRT (RP up)) (, ,) (S (VP (VP (VBG undermining) (NP (NP (DT the) (NN movie) (POS 's)) (NN reality))) (CC and) (VP (VBG stifling) (NP (NP (PRP$ its) (NN creator) (POS 's)) (JJ comic) (NN voice))))))))
(ROOT (S (VP (VB ) (PRT (RP )) (, ) (S (VP (VP (VBG ) (NP (NP (DT ) (NN ) (POS )) (NN ))) (CC ) (VP (VBG ) (NP (NP (PRP$ ) (NN ) (POS )) (JJ ) (NN ))))))))