you 're on the edge of your seat 
(ROOT (S (NP (PRP you)) (VP (VBP 're) (PP (IN on) (NP (NP (DT the) (NN edge)) (PP (IN of) (NP (PRP$ your) (NN seat))))))))
(ROOT (S (NP (PRP )) (VP (VBP ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (NN ))))))))