watch people doing unpleasant things to each other and themselves 
(ROOT (S (VP (VB watch) (S (NP (NNS people)) (VP (VBG doing) (NP (JJ unpleasant) (NNS things)) (PP (IN to) (NP (NP (DT each) (JJ other)) (CC and) (NP (PRP themselves)))))))))
(ROOT (S (VP (VB ) (S (NP (NNS )) (VP (VBG ) (NP (JJ ) (NNS )) (PP (IN ) (NP (NP (DT ) (JJ )) (CC ) (NP (PRP )))))))))