Another example is when I ran an evil campaign where the players were part of a necromancy cult and one of the players (The same one who made the terrible Crystal Pony) came up with some bullshit reason why their neutral character would be hanging with Necromancers, involving being based on some con-artist character on TV, because they didn't want to play an evil character (Even though they seem to be perfectly willing to play as a character who is a total jerk to everyone. I really hate that Crystal Pony). I ended up telling them to actually make an evil character or just don't play. They chose the latter. (This would technically count as a failure, since having such a limited pool of players means it's more important to try to get everyone involved than to just have the RP run the way I want it to. But at the time I was already frustrated at them)