the gum stuck under my seat trying to sneak out of the theater 
(ROOT (NP (NP (DT the) (NN gum)) (VP (VBD stuck) (PP (IN under) (NP (PRP$ my) (NN seat))) (S (VP (VBG trying) (S (VP (TO to) (VP (VB sneak) (PP (IN out) (PP (IN of) (NP (DT the) (NN theater))))))))))))
(ROOT (NP (NP (DT ) (NN )) (VP (VBD ) (PP (IN ) (NP (PRP$ ) (NN ))) (S (VP (VBG ) (S (VP (TO ) (VP (VB ) (PP (IN ) (PP (IN ) (NP (DT ) (NN ))))))))))))