I invited artist Marc Horowitz onto The Sound of Young America a few years ago, after I read an article about one of his projects in the San Francisco Chronicle. He had rented a burro, and was traveling around San Francisco, offering to help people with their chores. It was wonderful.
More recently, he's gotten some excellent notices for a piece which involved running a quarter mile of extension cord out his window and into a park, where he made coffee for anyone who wanted some, and another in which he traveled the nation, having dinner at people's houses.
Marc's website is ineedtostopsoon.com, and he's blogging his different projects there. He has some intruiging new ideas, including a short film montage of people in the moment that comes between giving the cashier your credit card, and that card's approval.
What I like about Marc is his commitment to thinking of cool things, then doing them. There's not enough of that in the world.