the concept behind kung pow : enter the fist is hilarious . 
(ROOT (S (NP (NP (NP (DT the) (NN concept)) (PP (IN behind) (NP (NN kung) (NN pow)))) (: :) (S (VP (VB enter) (NP (DT the) (NN fist))))) (VP (VBZ is) (ADJP (JJ hilarious))) (. .)))
(ROOT (S (NP (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ) (NN )))) (: ) (S (VP (VB ) (NP (DT ) (NN ))))) (VP (VBZ ) (ADJP (JJ ))) (. )))