those prone to indignation need not apply ; those susceptible to blue hilarity , step right up . 
(ROOT (S (S (NP (NP (DT those)) (ADJP (JJ prone) (PP (IN to) (NP (NN indignation))))) (VP (VBP need) (RB not) (VP (VB apply)))) (, ;) (S (NP (NP (DT those)) (ADJP (JJ susceptible) (PP (IN to) (NP (JJ blue) (NN hilarity))))) (, ,) (VP (NN step) (ADVP (RB right) (RP up)))) (. .)))
(ROOT (S (S (NP (NP (DT )) (ADJP (JJ ) (PP (IN ) (NP (NN ))))) (VP (VBP ) (RB ) (VP (VB )))) (, ) (S (NP (NP (DT )) (ADJP (JJ ) (PP (IN ) (NP (JJ ) (NN ))))) (, ) (VP (NN ) (ADVP (RB ) (RP )))) (. )))