susceptible to blue hilarity , step right up 
(ROOT (S (S (ADJP (JJ susceptible) (PP (IN to) (NP (JJ blue) (NN hilarity))))) (, ,) (VP (NN step) (ADVP (RB right) (RB up)))))
(ROOT (S (S (ADJP (JJ ) (PP (IN ) (NP (JJ ) (NN ))))) (, ) (VP (NN ) (ADVP (RB ) (RB )))))