is what we call the ` wow ' factor . 
(ROOT (S (VP (VBZ is) (SBAR (WHNP (WP what)) (S (NP (PRP we)) (VP (VBP call) (S (NP (DT the) (`` `) (NN wow) ('' ') (NN factor))))))) (. .)))
(ROOT (S (VP (VBZ ) (SBAR (WHNP (WP )) (S (NP (PRP )) (VP (VBP ) (S (NP (DT ) (`` ) (NN ) ('' ) (NN ))))))) (. )))