think of this dog of a movie 
(ROOT (S (VP (VB think) (PP (IN of) (NP (NP (DT this) (NN dog)) (PP (IN of) (NP (DT a) (NN movie))))))))
(ROOT (S (VP (VB ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (NN ))))))))