Bay to Breakers is definitely something you have to experience to believe. It has to be the largest costume party in the world. Thousands and thousands (55,000 plus) showed up to run and walk their way across the city from the bay to the ocean. Costumes included Angry Birds, I'm with Charlie Sheen girlfriends, underwear gnomes and regular gnomes, witches, Scooby Do, Napoleon Dynamite, fairies, etc. It is so San Francisco, and absolutely fabulous. Happy 100th anniversary to the Bay to Breakers 12K race.