I once saw a lady lick a large piece of chocolate into a self-portrait-sculpture of herself.
Also a man who sat in a bath tub full of water, with the dedication that he would not exit the tub until he had drunk all the liquid it contained, while admitting he would likely need to urinate into the water over time, and possibly even defecate. He was fully clothed, and I hoped he was wearing a diaper under his #####, but didn't even sort of want to ask. It was early on in the performance, and the water looked clean and drinkable, and he sipped it from a tea cup.
Also, some of my friends were once hired by a performance artist who used and entire government issued art grant to buy scratch and win tickets. My friends were paid to scratch lotto tickets during live "performances."
Also, I participated in a performance art piece where people were to come to an art gallery, pick out a hand made bunny sculpture, keep it with them for a year, then return the bunny, having written a story on the large tag around their neck. The bunny lived with me during a pivotal year in my life, then I wrote my story on it and returned it. I remember briefly thinking I just wanted to keep it, and the gallery had none of my information... but I did return it, with a sweet tale of how we used to torture our cats while saying "be the bunny! Be the bunny!" The exhibit went on to other parts of the world, and had been other places before. I had chosen a bunny who hadn't ever been taken for a year, but there were some that had already had one or two earlier homes. I wonder where that bunny is now, and if he's still covered in cat fur.
Also, I participated in another performance art thing, where my voice was recorded as I told a story. Apparently my story was then broadcast over the loud speakers in the largest art gallery in the area along with art related to the same themes as the story while a couple of my favorite singers also performed. This all happened while I was away, and it always feels odd that I was present, yet absent at this. I could have met two of my favorite performers, but I was somewhere else, working on a play at the time. It's nice to know they listened to my story though, especially since I'd enjoyed so much of their music. Sort of a decent exchange.