Luke: Apparently, he's been getting into some trouble and Liz is afraid he's heading for something bad and rather than handle it herself, she's given up. She's sending him here so I can straighten him out.
Lorelai: You?
Luke: Yes.
Lorelai: You can straighten him out?
Luke: Yes.
Lorelai: You, Luke Danes, the great communicator, you're going to straighten the kid out?
Luke: All he needs is a change of pace, a new crowd and to get away from the nut job that unfortunately is my sister.