File under "only in San Francisco"

After our delightful snack at Tartine we stopped by the Bi-Rite Market, just for fun, and then headed through the Mission District toward 101 to get to SFO. On the way we noticed a man sitting alone on a bus stop bench who was having a very animated conversation with himself.... in sign language. Whatever the "voices" in his head were saying, his hands and fingers were flying.