jump-in-your-seat moment 
(ROOT (NP (NML (S (VP (VB jump) (HYPH -) (PP (IN in) (HYPH -) (NP (PRP$ your) (HYPH -) (NN seat)))))) (NN moment)))
(ROOT (NP (NML (S (VP (VB ) (HYPH ) (PP (IN ) (HYPH ) (NP (PRP$ ) (HYPH ) (NN )))))) (NN )))