We already saw the first sneak preview of Blair and Serena at each other's throats. Now we have a second clip from Monday's "The Grandfather: Part II," featuring Dan and Olivia, who are getting along much better than B and S.

At least for the moment.

Clearly, O doesn't want Dan to see her appearance the previous night on Late Night with Jimmy Fallon. We don't know what, but she said something she wishes she hadn't. A guy in the NYU hall definitely watched it, at least.

Poor Dan. Always the last to know!

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Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.