Three or so tree sitters moved into these oak trees outside of UC Berkeley stadium in protest of a new practice field being built where the oak trees are now. They are supposed to stay in the trees full time, but when I was there, one of them was running around on the ground trying to sell tourists some books. Here is a close up of their buckets of urine: The whole thing is very California. As far as I know, they are still there if you want to head out and see them (I took these pictures on Dec 26, 2006). More on the tree sitters here and here.