Death of Rats
Right click the link to the sample below, choose "Save target as ..." and save it with your other sounds.
Thanks go to Hirokai for suggesting this trigger. It seems that they have all the fun over in Bes Pelargic. The Death of Rats turns up to claim the souls of rats when you kill them. The rat asks "Squeak?" to which the inevitable answer is "SQUEAK". I've heard that this may now be happening in other places too. Anyway, here's a trigger for it. Rather than use the sample that was suggested I have created this one that includes both sides of this final conversation. Hope you like it Hirokai.