of watching intelligent people making a movie 
(ROOT (PP (IN of) (S (VP (VBG watching) (S (NP (JJ intelligent) (NNS people)) (VP (VBG making) (NP (DT a) (NN movie))))))))
(ROOT (PP (IN ) (S (VP (VBG ) (S (NP (JJ ) (NNS )) (VP (VBG ) (NP (DT ) (NN ))))))))