PARIS: What about that guy over there? What’s his story?
LUKE: Reverend Nichols?
PARIS: Reverend Nichols, huh? What is that, like Dr. Feelgood?
A reference to the 1989 song Dr. Feelgood, by heavy metal band Mötley Crüe. It was the lead single from their album of the same name, and went to #6 in the US. It is their most successful single, and the only one which went gold.
The song is about a L.A. drug dealer named Jimmy who is known as “Dr. Feelgood”. The original lyrics were on a different subject, but bassist and songwriter Nikki Sixx based it on his experiences with different drug dealers, so that Dr. Feelgood is a composite of several real-life characters. Nikki Sixx, who almost died from a heroin overdose in 1987, declared himself clean and sober in 2004.