amused with its low groan-to-guffaw ratio 
(ROOT (VP (VBN amused) (PP (IN with) (NP (PRP$ its) (JJ low) (NML (NML (NN groan)) (HYPH -) (PP (IN to) (HYPH -) (NP (NN guffaw)))) (NN ratio)))))
(ROOT (VP (VBN ) (PP (IN ) (NP (PRP$ ) (JJ ) (NML (NML (NN )) (HYPH ) (PP (IN ) (HYPH ) (NP (NN )))) (NN )))))