We'd go with stunt-meister Kaufman's brawl with pro wrestler Jerry Lawler on "David Letterman," but that wasn't live (and neither was Drew Barrymore's desk-top strip-tease, which is why it doesn't qualify, either). But Kaufman's antics on ABC's "SNL" rip-off "Fridays" -- where he stormed out of a lame sketch and splashed a fellow cast member (Michael Richards) in the face with water -- were watched in real-time by a baffled audience -- to this day, nobody is quite sure how much of the imbroglio (which ended with producer Jack Burns storming the stage) was real, and how much was a practical joke.