Dan: Serena, hey.
Serena: What are you really doing here, Dan?
Dan: What am I doing here? I ran across the city, I rent a tuxedo, I stole this mask from some drunken kid only to look like Robin, I conned my way in here all to see you. I care.
Serena: Well, you didn't seem to care this morning when you were with another girl and lied about it.