Across whole show

Woody: How can Darth Vader be Luke Skywalker's father? They don't even have the same last name.

Sam: Diane, I've got a problem.

Diane: Who is she, and how many months?

Diane Meets Mom (series 3)

Frasier's Mother: [Referring to Diane] I understand you used to date that woman.

Sam Malone: That's right.

Frasier's Mother: How much would it take to start things up again?

Sam Malone: You don't have enough money.

Frasier's Mother: How do you know?

Sam Malone: There isn't enough money.