Ryan and Esposito wager that they can solve their case before Castle and Beckett on Castle. "The Double Down" is the second episode of the show's second season.
Dr. Parish: Looks like a patient lost his patience. Castle: Also his command of grammar. You're should be you-'-re as in you are, that's not even a tough one not like when to use who or whom. Beckett: Do you really think that's the take away here Castle? Castle: I'm just saying whoever killed her also murdered the English language.
