barry convinces us he 's a dangerous , secretly unhinged guy who could easily have killed a president because it made him feel powerful . 
(ROOT (S (NP (NNP barry)) (VP (VBZ convinces) (NP (PRP us)) (SBAR (S (NP (PRP he)) (VP (VBZ 's) (NP (NP (DT a) (JJ dangerous) (, ,) (ADJP (RB secretly) (JJ unhinged)) (NN guy)) (SBAR (WHNP (WP who)) (S (VP (MD could) (ADVP (RB easily)) (VP (VB have) (VP (VBN killed) (NP (DT a) (NN president)) (SBAR (IN because) (S (NP (PRP it)) (VP (VBD made) (S (NP (PRP him)) (VP (VB feel) (ADJP (JJ powerful))))))))))))))))) (. .)))
(ROOT (S (NP (NNP )) (VP (VBZ ) (NP (PRP )) (SBAR (S (NP (PRP )) (VP (VBZ ) (NP (NP (DT ) (JJ ) (, ) (ADJP (RB ) (JJ )) (NN )) (SBAR (WHNP (WP )) (S (VP (MD ) (ADVP (RB )) (VP (VB ) (VP (VBN ) (NP (DT ) (NN )) (SBAR (IN ) (S (NP (PRP )) (VP (VBD ) (S (NP (PRP )) (VP (VB ) (ADJP (JJ ))))))))))))))))) (. )))