why it 's so successful at lodging itself in the brain 
(ROOT (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 (SBAR (WHADVP (WRB )) (S (NP (PRP )) (VP (VBZ ) (ADJP (RB ) (JJ ) (PP (IN ) (S (VP (VBG ) (NP (PRP )) (PP (IN ) (NP (DT ) (NN )))))))))))