This is a question I hear a lot. There’s no absolute sure fire way to make your Furby change personalities on demand, but there is one thing you can do when your little angel turns into a little devil. I’ve read (and even posted?) that petting and treating your Furby gently will eventually cause its personality to switch back from Evil little monster to the sweet personality it started with. This method usually works after a long while. But lets face it when we want something, we want it now right? The magic miracle here is Music. It apparently soothes the savage Furby beasts too.
It’s hard to say what causes them to turn angry but when your Fuzzy friend turns to the dark side, just play it some music. It will twitch, act like its too good for your music and perhaps shout something mean at you in Furbish but inevitably start moving to the beat, and before your very eyes transform back into the nice chatty Furby it used to be.
If this doesn’t work.. Well, then it’s time to call in an exorcist. ;o)