I've read this before, and while, yes, it is very sweet and everything, there is something deeply sad about the fact that Harley can ONLY love the Joker when he's - in his own words - 'a homicidal lunatic'. I mean, how many times has Harley strove to win Mistah J's love and affection? How many times has she thrown her own sanity back in the toilet simply because she thinks it'll make him happy? And now that she finally HAS his love and affection, she isn't interested in him - she only wants the old Joker, the one who ignored, used, and frequently threatened/tried to kill her. That is what I call a deeply dysfunctional relationship.