halfway through the movie , the humor dwindles . 
(ROOT (S (ADVP (RB halfway) (PP (IN through) (NP (DT the) (NN movie)))) (, ,) (NP (DT the) (NN humor)) (VP (VBZ dwindles)) (. .)))
(ROOT (S (ADVP (RB ) (PP (IN ) (NP (DT ) (NN )))) (, ) (NP (DT ) (NN )) (VP (VBZ )) (. )))