Once upon a time, it was a stand-up comedian's job to simply entertain the audience and make them laugh. That job has evolved over the years, and while it can be argued that stand-up comics have always been provocateurs of a sort, the border between provocation and comedic entertainment has been pushed over the last few decades. Don Rickles introduced the concept of insult comedy in the 50s, Andy Kaufman redefined performance art in the 70s, Andrew Dice Clay pushed the limits further in the 80s as The Diceman, and the 90s saw the rise of stand-…