Castle, Season 2

[Beckett, Castle, Ryan, and Esposito figure out how the murderers committed the crime]

Beckett:
Except it's all circumstantial. The DA will never buy it without hard evidence or a confession.

Esposito:
Oh, we're gonna get a confession.

[Beckett and Castle both scoff as they look at each other and then back at Ryan and Esposito]

Castle:
Not if we get one first.

Ryan:
So, bet's back on?

Beckett:
[getting in his face] You bet your britches the bet is back on.