the troubling thing about clockstoppers is that it does n't make any sense . 
(ROOT (S (NP (NP (DT the) (JJ troubling) (NN thing)) (PP (IN about) (NP (NNS clockstoppers)))) (VP (VBZ is) (SBAR (IN that) (S (NP (PRP it)) (VP (VBZ does) (RB n't) (VP (VB make) (NP (DT any) (NN sense))))))) (. .)))
(ROOT (S (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NNS )))) (VP (VBZ ) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ) (RB ) (VP (VB ) (NP (DT ) (NN ))))))) (. )))