In Venice, CA. Note he has written a © at the end of his missive, and "patent pending" underneath it. Every New Yorker has a few homeless person stories, so here's one of mine from the 1990s. Man walks up to me in the West Village and says "Give me a quarter and I'll tell you a joke." I said "I gotta hear the joke first." He said, "What do you get when you put President Clinton in a meat grinder? President Gore." I gave him a quarter.
Related: a round-up of homeless awareness ads/stunts from around the world.