Your favorite rapper's favortie rapper (bka Jay-Z) performed "Picasso Baby" for six hours at Pace gallery as part of a performance piece today. Guests included artists Marina Abramovic (aka The Grandmother of Performance Art) and Sanford Biggers, among other celebrities and local New Yorkers. Our intrepid assistant editor Cedar Pasori caught the day's weirdest moment on Vine. As Hov raps watch as a green-shirted lady scoots by with a cast on. Performance art at its finest (and by "finest" we mean strangest).