I don't allow Players to play, nor do I allow Humans, Fighters, Swords, Dragons, Dungeons, or Orcs in any of my games. When we (my cats, fish, and Tom (invisible)) sit down to play I make sure that their characters start out as 10th level Draco-Lich-Were-Green Slim-Ghosts with unlimited Wish spells.
Hmm... All the campains I made I liked too much to let players in and destroy them... And i don't DM well. So either they don't want to, or I won't let them...