by Mychal ThompsonBuzzFeedBuzzFeed Staff I've learned that I live in a bubble of people who are constantly online, consuming everything pop culture, and that's not everybody's reality. I had a rude awakening really hit when a friend thought Martin Short was just the guy from Only Murders in the Building. Hulu/Disney / Courtesy Everett Collection So, as a decades-long Saturday Night Live fan, I want to impart my knowledge of popular celebs and creatives who you probably didn't know started on SNL. 1. Believe it or not, the comedic timing of Iron Man's Robert Downey Jr.