I mentioned recently that I re-read the Chris Farley biography "The Chris Farley Show." It's a really sad look at a troubled man whose life was cut short by drug addiction. The book is divided into three parts - his early life, breaking out in SNL and movies, and finally his death.
One of the last high-profile things Chris Farley did before his death was to host Saturday Night Live for the first time. It was a few months before he died. The only memorable skit to come from that show was the "El Nino" bit ("El Nino is Spanish for... the Nino"). Other than that, the show was notable for seeing Farley at his heaviest and possibly his most dependent on drugs. According to the book, he was under the influence during the show and it's one of the few episodes that SNL does not show in syndication.
During an appearance on the Howard Stern Show, Jim Breuer (of "Half Baked" fame) recounted a story about Farley hosting, as Breuer was a cast member at the time. It's embedded below in two YouTube videos. Having a SNL host is a week-long event, with writing the show, rehearsing it, and then finally Saturday night.
Breuer talks about Farley deciding to hang with him early on, then learning the severity of Farley's drug issues and distancing himself, and a depressing phone conversation the two shared. He also reveals that Chris Rock was on set as a backup host, in case things fell through with Farley. It's an interesting story that you should check out. Also, Breuer's Tracy Morgan impression is hilarious. If for nothing else, watch it for that.