@Deserted- my favorite roleplaying story-line would probably be the last one I was a player in. We started out as an evil party (Pathfinder) and I was a half-orc farrier who'd been imprisoned wrongly and had gone evil and ended up REALLY disliking humans. We rampaged around for a while (set a seaside town on fire in an epic meltdown) and then I got cursed (alignment change to neutral good). 

The rest of the campaign was me trying to atone for my sins by building a new society where the racial tensions were no longer an issue. The character change from 'burn the establishment down and murder them all' to 'oh god what have I done' was so much fun to play! And an interesting twist on my very first evil campaign lol.