Quote from Emily in Haunted Leg
Lorelai: Now, please, Mom, tell me, why did you ask me to lunch? Emily: Because I wanted to spend some time alone with my daughter. Lorelai: Mom. Emily: Well, Rory drops by after school every now and then, so we see her alone. Lorelai: Mom. Emily: But we never see you alone... unless Rory leaves the room for a second, and even then you try to go with her. If I had a nickel for every time you've used the "Girls always go to the bathroom together, Mom" line, I'd be a very rich woman. Lorelai: You are a very rich woman.