, you 'd have a hard time believing it was just coincidence . 
(ROOT (S (, ,) (NP (PRP you)) (VP (MD 'd) (VP (VB have) (NP (DT a) (JJ hard) (NN time)) (S (VP (VBG believing) (SBAR (S (NP (PRP it)) (VP (VBD was) (NP (RB just) (NN coincidence))))))))) (. .)))
(ROOT (S (, ) (NP (PRP )) (VP (MD ) (VP (VB ) (NP (DT ) (JJ ) (NN )) (S (VP (VBG ) (SBAR (S (NP (PRP )) (VP (VBD ) (NP (RB ) (NN ))))))))) (. )))