by turns very dark and very funny 
(ROOT (PP (IN by) (VP (VBZ turns) (ADJP (ADJP (RB very) (JJ dark)) (CC and) (ADJP (RB very) (JJ funny))))))
(ROOT (PP (IN ) (VP (VBZ ) (ADJP (ADJP (RB ) (JJ )) (CC ) (ADJP (RB ) (JJ ))))))