is to sit through about 90 minutes of a so-called ` comedy ' and not laugh once . 
(ROOT (S (VP (VBZ is) (S (VP (TO to) (VP (VP (VB sit) (PP (IN through) (NP (NP (QP (RB about) (CD 90)) (NNS minutes)) (PP (IN of) (NP (DT a) (ADJP (RB so) (HYPH -) (VBN called)) (`` `) (NN comedy) ('' ')))))) (CC and) (RB not) (VP (VB laugh) (ADVP (RB once))))))) (. .)))
(ROOT (S (VP (VBZ ) (S (VP (TO ) (VP (VP (VB ) (PP (IN ) (NP (NP (QP (RB ) (CD )) (NNS )) (PP (IN ) (NP (DT ) (ADJP (RB ) (HYPH ) (VBN )) (`` ) (NN ) ('' )))))) (CC ) (RB ) (VP (VB ) (ADVP (RB ))))))) (. )))