about the best thing you could say about narc 
(ROOT (PP (IN about) (NP (NP (DT the) (JJS best) (NN thing)) (SBAR (S (NP (PRP you)) (VP (MD could) (VP (VB say) (PP (IN about) (NP (NN narc))))))))))
(ROOT (PP (IN ) (NP (NP (DT ) (JJS ) (NN )) (SBAR (S (NP (PRP )) (VP (MD ) (VP (VB ) (PP (IN ) (NP (NN ))))))))))