Marshall: Robin, what are you doing for Halloween?
Robin: Oh, I don't know. Probably hanging out with Mike, this guy I've been seeing.
Lily: Mike? There's a Mike? You have a boyfriend? You haven't told us?
Robin: No, I mean, he's not my boyfriend. He's just this guy I've been seeing for a couple of weeks.
Lily: [sing-songy] Boyfriend.
Marshall: So why haven't we met him?
Robin: We're not really ready to go public yet.
Barney: [sing-songy] Married.