When Law Enforcement SUDDENLY (therefore "INSTANT") becomes aware -- after the fact -- that many previous murders, probably stretching over many years time -- are actually the work of a SERIAL killer ("serial" sounds like "cereal" = "breakfast").
O'MALLY: Oh my God!
DRUMMOND: What O'Mally?
O'MALLY: Instant Breakfast, Drummond!
DRUMMOND: Are you sure? What cases are you talking about?
O'MALLY: Come here. I'll show you.