, it may just scare the pants off you . 
(ROOT (S (, ,) (NP (PRP it)) (VP (MD may) (ADVP (RB just)) (VP (VB scare) (NP (DT the) (NNS pants)) (PP (IN off) (NP (PRP you))))) (. .)))
(ROOT (S (, ) (NP (PRP )) (VP (MD ) (ADVP (RB )) (VP (VB ) (NP (DT ) (NNS )) (PP (IN ) (NP (PRP ))))) (. )))