's at once laughable and compulsively watchable 
(ROOT (VP (VBZ 's) (CONJP (IN at) (RB once)) (ADJP (ADJP (JJ laughable)) (CC and) (ADJP (RB compulsively) (JJ watchable)))))
(ROOT (VP (VBZ ) (CONJP (IN ) (RB )) (ADJP (ADJP (JJ )) (CC ) (ADJP (RB ) (JJ )))))