Yoko Ono, Cut Piece, 1965
 This is similar to the Marina Abramovic piece Rhythm 0 that I posted earlier, although Yoko’s performance happened 9 years before. Yoko Ono’s performance piece deals with addressing issues of gender violence by directly implicating the spectator. She was kneeling on a stage, impassive, and then the audience was invited to come and cut off pieces of her clothing.
The human body is a sign of experience and identity, and performance art reflects this.
You can see a couple of videos of this piece at these two links:
http://www.youtube.com/watch?v=Zfe2qhI5Ix4
http://www.dailymotion.com/video/x3dsvy_yoko-ono-cut-piece_shortfilms