it wears you down like a dinner guest showing off his doctorate 
(ROOT (S (NP (PRP it)) (VP (VBZ wears) (NP (PRP you)) (PRT (RP down)) (PP (IN like) (NP (NP (DT a) (NN dinner) (NN guest)) (VP (VBG showing) (PRT (RP off)) (NP (PRP$ his) (NN doctorate))))))))
(ROOT (S (NP (PRP )) (VP (VBZ ) (NP (PRP )) (PRT (RP )) (PP (IN ) (NP (NP (DT ) (NN ) (NN )) (VP (VBG ) (PRT (RP )) (NP (PRP$ ) (NN ))))))))