[Akryn]

_ is just a common way of basically telling the game "I don't care about this" -- in this case, it's in the slot for the message, and we only care about the name.

I only actually posted two versions (well three now). The other posters weren't me.

If you'd like to add customisable phrases that's certainly doable. Note that in this version the {} are not optional, but the comma and second phrase are. If you omit that part, it will use the default:

local me = CreateFrame("Frame")

me:RegisterEvent("CHAT_MSG_MONSTER_EMOTE")
me:RegisterEvent("CHAT_MSG_MONSTER_SAY")
me:RegisterEvent("CHAT_MSG_MONSTER_WHISPER")
--add any others...that's probably good enough

me.listOfNames = {
     {"Ringo"},
     {"Kerlonian Evershade", "Darn it!  That lazy druid has fallen asleep again, use the horn!!!"},
     {"Shay"},
     {"A-Me 01"},
     --etc
}

me.EventHandler(self, event, _, name)
      for i = 1, #self.listOfNames do
           if name:find(self.listOfNames[i][1]) then
                 PlaySound("RaidWarning")
                 local msg = self.listOfNames[i][2] or "Heads Up!  Your quest NPC needs help!!!"
                 RaidWarningFrame:AddMessage(msg)
                 return
           end
      end
end

me:SetScript("OnEvent", me.EventHandler)

edit: matrix fail -_-