Robin: Ted's still coming to this thing, right?
Lily: Yep.
Robin: Do you think, um... hypothetically... it would be weird if I bring a date?
Lily: Look at you, Scherbatsky, blatantly trying to make Ted jealous.
Robin: No, it's just this guy at the station. I never get involved with co-workers, but he asked me and I said yes. Is it going to be weird?
Lily: No, it's not going to be weird at all.
[cut to:]
Lily: [on the phone] Robin's bringing a date.
Marshall: Boy. That's going to be really weird.
Lily: I know.