who will be moved to the edge of their seats by the dynamic first act 
(ROOT (SBAR (WHNP (WP who)) (S (VP (MD will) (VP (VB be) (VP (VBN moved) (PP (IN to) (NP (NP (DT the) (NN edge)) (PP (IN of) (NP (PRP$ their) (NNS seats))))) (PP (IN by) (NP (DT the) (JJ dynamic) (JJ first) (NN act)))))))))
(ROOT (SBAR (WHNP (WP )) (S (VP (MD ) (VP (VB ) (VP (VBN ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (NNS ))))) (PP (IN ) (NP (DT ) (JJ ) (JJ ) (NN )))))))))