addition to gluing you to the edge of your seat 
(ROOT (NP (NN addition) (PP (IN to) (S (VP (VBG gluing) (NP (PRP you)) (PP (IN to) (NP (NP (DT the) (NN edge)) (PP (IN of) (NP (PRP$ your) (NN seat))))))))))
(ROOT (NP (NN ) (PP (IN ) (S (VP (VBG ) (NP (PRP )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (NN ))))))))))