UPDATE - 3/22@8:32AM: The episode is now available online at this link. The Rush reference occurs at about the 5:40 mark.

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There was a Rush reference on tonight's episode of the NBC action/comedy Chuck (Season 4, Episode 19: Chuck Versus the Muuurder). The character Morgan Grimes is interviewing potential new agents and after asking a series of serious questions to a group of candidates, he asks one of them Quick! What is Rush's best album?! to which the candidate replies Caress of Steel. Morgan then makes a buzzer noise, looks at the candidate with disappointment and says nope... next!. This is the second major Rush reference on Chuck. The first occurred in Episode 5 of Season 2: Chuck vs. Tom Sawyer back on October 27, 2008. Thanks to drmdawg13 and Falcon for the heads up.