I love challenges: playing with Poles in the WW2 as Germans attack, playing Germans on D-day and after, playing good char if his/her race is more evil than not, playing evil 'goody-goodys', playing a dwarf between lots of elves (:D ), playing mage with more than one magic-hater in the group, playing pacifist in the middle of a war, playing villain in the greatest empire of law and goodness, playing a dog when anyone else is human, or playing an unique character when anyone else tries to be a clone of his/her favorite character
You all should do this too