Lorelai: So everyone in the entire world knew the plural of cul-de-sac was culs-de-sac?
Richard: Yes.
Lorelai: Okay. So Mariah Carey is out with some friends and she's had a couple cocktails, she glances down from the roof and says, "Oh, look at all those culs-de-sac."
Rory: Why are they on the roof?
Lorelai: It's a rooftop bar.
Richard: How have you been saying it?
Lorelai: Cul-de-sacs.
Richard: And no one ever corrected you?
Lorelai: No, because that's the way it should be. Even if it isn't technically correct, it should be pronounced that way.
Rory: Mom, Mom, just let it go.
Lorelai: I will never let this go.