Lily: What's important is that I can't stand the idea of Marshall dating another woman. I mean, what if he falls in love with her?
Robin: Well, if it makes you feel any better, Ted says she has the crazy eyes.
Lily: What's that?
Robin: Apparently, a thing women have that guys can see and it tells them that the girl's crazy.
Lily: Oh, kind of like how you never want to date a guy with perfect fingernails?
Robin: Jerk nails. Exactly.