Harleen Quinzel and Joker in “Unfinished Business”

Care to tell me how this got in my office?

Joker

I put it there.

I think the guards would be interested to know you've been out of your cell.

Joker

If you really were going to tell, you already would have. You know, sweets, I like what I've heard about you, especially the name, Harleen Quinzel. Rework it a bit, and you get Harley Quinn.

Like the clown character, "Harlequin". I know. I've heard it before.

Joker

It's a name that puts a smile on my face. It makes me feel there's someone here I can relate to. Someone who might like to hear my secrets.