is a purposefully reductive movie -- which may be why it 's so successful at lodging itself in the brain . 
(ROOT (S (VP (VBZ is) (NP (NP (DT a) (ADJP (RB purposefully) (JJ reductive)) (NN movie)) (, --) (SBAR (WHNP (WDT which)) (S (VP (MD may) (VP (VB be) (SBAR (WHADVP (WRB why)) (S (NP (PRP it)) (VP (VBZ 's) (ADJP (RB so) (JJ successful) (PP (IN at) (S (VP (VBG lodging) (NP (PRP itself)) (PP (IN in) (NP (DT the) (NN brain)))))))))))))))) (. .)))
(ROOT (S (VP (VBZ ) (NP (NP (DT ) (ADJP (RB ) (JJ )) (NN )) (, ) (SBAR (WHNP (WDT )) (S (VP (MD ) (VP (VB ) (SBAR (WHADVP (WRB )) (S (NP (PRP )) (VP (VBZ ) (ADJP (RB ) (JJ ) (PP (IN ) (S (VP (VBG ) (NP (PRP )) (PP (IN ) (NP (DT ) (NN )))))))))))))))) (. )))