LORELAI: Honey, you gotta ease up on that love potion you’ve been giving him or he’s gonna start showing up at David Letterman’s house soon.
In May 1988, David Letterman was stalked by a mentally ill woman named Margaret “Peggy” Ray, who stole his car, camped on his tennis court, and repeatedly broke into his house. Her exploits gained national attention, and Letterman joked about her on his show sometimes, but without ever naming her. Ray served 34 months in prison and psychiatric hospitals for stalking Letterman, but refused to continue her medication upon her release, and went on to stalk astronaut Story Musgrove. She killed herself in 1998. Both Letterman and Musgrove expressed sympathy for her – “A sad ending to a confused life”, said a spokesman for Letterman.
Another rather distasteful joke about mental illness and suicide, and the implication that it is somehow Rory’s “fault” that Dean is behaving so obsessively. There does seem to be a slight acknowledgement here from Lorelai that Dean’s behaviour is abnormal and unhealthy.