Once upon a time i run a evil campain called The Necrocampaing. Where all the players made evil characters that were members of a evil cabal of necromancers. They killed innocent children for necromantic rituals and thought themselves as big bad villains.
The king blamed them for everything bad in the kingdom, had they done it or not as they were the perfect spacegoats. Eventually they discovered that they only existed because if the paladin inquisition were not busy chasing necromantic cabals, the nobles schemes to live in opulence at the common folk expenses would be exposed. Soon they chased someway to clear the name of necromacy so they could be local evils in peace. But real life TPked this campaing, it was fun.