does seem pretty unbelievable at times 
(ROOT (VP (VBZ does) (VP (VB seem) (S (ADJP (RB pretty) (JJ unbelievable))) (PP (IN at) (NP (NNS times))))))
(ROOT (VP (VBZ ) (VP (VB ) (S (ADJP (RB ) (JJ ))) (PP (IN ) (NP (NNS ))))))