http://blog.makezine.com/archive/arts/index.html

Jay writes -

I tied a disposable camera to a bench with a sign that read:

Good afternoon,
I attached this camera to the bench so you could take pictures. Seriously. So have fun. I'll be back later this evening to pick it up.
Love, Jay / The Plug

When I retrieved the camera that night, I was happy to find that the entire roll of film had been shot.