I've made a list of sounds that I know of when reversed say something.
MiniSpritPissed1-Illidan is out there somewhere.
MiniSpiritReady1-The hunt awaits.
MiniSpiritWhat1-No longer.
MiniSpiritWhat2-?Ribbit Kills/Ridicules? you.
MiniSpiritWhat3-Must hurry.
MiniSpiritYes1-The end.
MiniSpiritYes2-Finish the hunt.
MiniSpiritYes3-Now is the time.
SpiritOfVengeanceWhat2-Oh shit ah.
SpirirOfVengeanceYes2-Must kill.
They usually are, if you can tell, without reversing what a sound says, then your an absolute genious. It may be fairly easy to tell its reversed, just not easy to understand it.