's a hellish , numbing experience to watch 
(ROOT (VP (VBZ 's) (NP (NP (DT a) (JJ hellish) (, ,) (JJ numbing) (NN experience)) (SBAR (S (VP (TO to) (VP (VB watch))))))))
(ROOT (VP (VBZ ) (NP (NP (DT ) (JJ ) (, ) (JJ ) (NN )) (SBAR (S (VP (TO ) (VP (VB ))))))))