I found this on a blog somewhere on the wacky world inter-web thingy.

"Reading all this crappola about Kaufman, one of my childhood heroes, reminded me of the documentary Running Fence (1978) that I saw while attending the Savannah College of Art & Design on the conceptual artist Christo in which Mr. Kaufman makes a cameo appearance. Or at least, I think he does. It was one of those things where I was the only person watching the documentary who noticed Kaufman's presence. I have never been able to verify this, but now the documentary, along with four others about Christo and his wife Jeanne-Claude produced and directed by the Maysles brothers, is available on the DVD."