A Frasier Casablanca moment

From "It’s Hard to Say Goodbye If You Won’t Leave" (third season). Niles has brought over a videotape of Casablanca to watch with his father:

Daphne: Oh, I just love that movie. Is there any more heartbreaking moment in all of film than when Humphrey Bogart tells Ingrid Bergman to get on that plane with Victor Laszlo even though Bogey loves her? What an ending.

Niles: Well, there goes my need to finally see that one.

Not long after, Frasier pleads with a lady friend not to leave Seattle and more or less reverses Rick’s words to Ilsa at the airport (“If you’re on that plane, we’ll regret it”).