White Collar, Season 4

Peter:
You ever wonder what would've happened if I hadn't made you my C.I.?

Neal:
I'd still be in jail and your arrest rate would be in the low 70s.

Peter:
High 80s.

Neal:
Why did you take my deal?

Peter:
I told you, your expertise.

Neal:
That's all?

Peter:
I realized... all those crimes you were committing, they were never about money, or greed.

Neal:
What do you think they were about?

Peter:
The challenge. That's what we have in common. I love the challenge.

Neal:
I know you do.

Peter:
And after all those years of chasing you, your cryptic clues, your late-night phone calls from international numbers...

Neal:
Yeah, and the cookies, and birthday cards...

Peter:
Yeah. I realized I liked you. That's why I took your deal.