you can not guess why the cast and crew did n't sign a pact to burn the negative and the script and pretend the whole thing never existed . 
(ROOT (S (NP (PRP you)) (VP (MD can) (RB not) (VP (VB guess) (SBAR (WHADVP (WRB why)) (S (NP (DT the) (NN cast) (CC and) (NN crew)) (VP (VBD did) (RB n't) (VP (VB sign) (NP (DT a) (NN pact) (S (VP (TO to) (VP (VP (VB burn) (NP (NP (DT the) (NN negative)) (CC and) (NP (DT the) (NN script)))) (CC and) (VP (VB pretend) (SBAR (S (NP (DT the) (JJ whole) (NN thing)) (ADVP (RB never)) (VP (VBD existed))))))))))))))) (. .)))
(ROOT (S (NP (PRP )) (VP (MD ) (RB ) (VP (VB ) (SBAR (WHADVP (WRB )) (S (NP (DT ) (NN ) (CC ) (NN )) (VP (VBD ) (RB ) (VP (VB ) (NP (DT ) (NN ) (S (VP (TO ) (VP (VP (VB ) (NP (NP (DT ) (NN )) (CC ) (NP (DT ) (NN )))) (CC ) (VP (VB ) (SBAR (S (NP (DT ) (JJ ) (NN )) (ADVP (RB )) (VP (VBD ))))))))))))))) (. )))