what makes it worth watching 
(ROOT (SBAR (WHNP (WP what)) (S (VP (VBZ makes) (S (NP (PRP it)) (ADJP (JJ worth) (S (VP (VBG watching)))))))))
(ROOT (SBAR (WHNP (WP )) (S (VP (VBZ ) (S (NP (PRP )) (ADJP (JJ ) (S (VP (VBG )))))))))