Looking into film pieces, I was looking at Yoko Ono's cut piece. 

Where she invited the audience members to cut pieces of her clothing off, this is the sort of concept I'm looking at almost suffering for the artwork. By asking others to do things to her, pushing boundaries between the performer and the audience. This brought her back to her natural state and took away her identity throughout clothes. 

A more prime example of this would be Marina Abramovic's RHYTHM 0, 1974, where she placed different items on the table infront of her, and invited the audience to come up and pick any weapon and do anything to her. This was opening up a entire different aspect to performance art, as she put items such as knifes, a gun and other items which could cause her pain or pleasure. She put herself on display for people to do anything they wanted to her. A man was going to shoot her, until someone else stopped him. This showed how as a 'performer' she was treated differently to how she wouldve usually been treated. The viewers/participators lost there morals and acted in ways they wouldn't usually. Putting herself through pain and suffering to discover the different relationship between performer and audience.