I am a big X-Files fan, and so last night I was reading through Volume 2 (third season) of the Official Guide to The X-Files, and I found something GB-related in the back story of an episode called "Lonely Hearts". The ep was about a man who found overweight women online, and then killed them and sucked out their fat because of a genetic deficiency where he couldn't produce any. Anyways, he secreted this substance on them, and in the back story, it said the substance was a "doctored-up" form of something called "Ultra-slime", which, it said, was used in the first Ghostbusters movie. That's all. Just that one reference. Probably only interesting to me, considering that I am a huge fan of both shows.