not amused by the sick sense of humor 
(ROOT (S (RB not) (VP (VBN amused) (PP (IN by) (NP (NP (DT the) (JJ sick) (NN sense)) (PP (IN of) (NP (NN humor))))))))
(ROOT (S (RB ) (VP (VBN ) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN ))))))))