they are what makes it worth the trip to the theater . 
(ROOT (S (NP (PRP they)) (VP (VBP are) (SBAR (WHNP (WP what)) (S (VP (VBZ makes) (S (NP (PRP it)) (ADJP (JJ worth) (NP (NP (DT the) (NN trip)) (PP (IN to) (NP (DT the) (NN theater)))))))))) (. .)))
(ROOT (S (NP (PRP )) (VP (VBP ) (SBAR (WHNP (WP )) (S (VP (VBZ ) (S (NP (PRP )) (ADJP (JJ ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (NN )))))))))) (. )))