's a bad sign when they 're supposed to be having a collective heart attack 
(ROOT (S (VP (VBZ 's) (NP (DT a) (JJ bad) (NN sign)) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VBP 're) (VP (VBN supposed) (S (VP (TO to) (VP (VB be) (VP (VBG having) (NP (DT a) (JJ collective) (NN heart) (NN attack)))))))))))))
(ROOT (S (VP (VBZ ) (NP (DT ) (JJ ) (NN )) (SBAR (WHADVP (WRB )) (S (NP (PRP )) (VP (VBP ) (VP (VBN ) (S (VP (TO ) (VP (VB ) (VP (VBG ) (NP (DT ) (JJ ) (NN ) (NN )))))))))))))