Protective Jonathan Crane

Jonathan Crane already has a friend (alright, maybe he has two), he doesn't need another. Jervis Tetch disagrees.

AKA, I read The Long Halloween and then wrote a pre-relationship Hattercrow fic based on that one scene where they're robbing a bank using a horse-drawn carriage.

In a world where Joker isn't a murderous, abusive scumbag, he wouldn't be the kind of guy to manipulate a young psychiatrist into losing her mind.

So how did Doctor Harleen Quinzel become the infamous Harley Quinn?