Castle, Beckett and others in “Fool me Once”

Castle

[on CIA Agent Gray] This man is a machine. I've interviewed serial killers, hitmen. Agent Gray?

Beckett

Mm-hmm?

Castle

By far, the most dangerous man I've ever met. [looks around and whispers] He once killed a North Korean agent with a melonballer.

[suddenly appearing behind them] It was an ice cream scoop, Castle. And that information was supposed to remain private.

Castle

Sorry.