What causes Palpatine to suddenly look like a raisin? He gets zapped up by the lightning which I suppose could have caused it, except a bunch of people get zapped throughout the series and no one else looks any different.
His eye colour changes, which is meant to signify someone giving in to the Dark Side as seen with Anakin. (Why doesn't Dooku have that going on? hmm). So maybe everything else goes weird because of he's no longer hiding his Dark Side power? A mix of him being a heavy Dark Side user and being hit by concentrated Dark Side power?
Does any one know of a reason? If not, have any theories?