one well-timed explosion in a movie can be a knockout , but a hundred of them can be numbing . 
(ROOT (S (S (NP (NP (CD one) (ADJP (RB well) (HYPH -) (VBN timed)) (NN explosion)) (PP (IN in) (NP (DT a) (NN movie)))) (VP (MD can) (VP (VB be) (NP (DT a) (NN knockout))))) (, ,) (CC but) (S (NP (NP (DT a) (CD hundred)) (PP (IN of) (NP (PRP them)))) (VP (MD can) (VP (VB be) (ADJP (VBG numbing))))) (. .)))
(ROOT (S (S (NP (NP (CD ) (ADJP (RB ) (HYPH ) (VBN )) (NN )) (PP (IN ) (NP (DT ) (NN )))) (VP (MD ) (VP (VB ) (NP (DT ) (NN ))))) (, ) (CC ) (S (NP (NP (DT ) (CD )) (PP (IN ) (NP (PRP )))) (VP (MD ) (VP (VB ) (ADJP (VBG ))))) (. )))