Here's your opportunity to truly be free. You will join hundreds, if not thousands, of San Franciscan's who like to ride the subway (BART and MUNI) without pants. You should wear colorful and festive underwear if you have it. Great socks help also. The point is to keep a straight face during the entire ride. Bring money for the train. Wear normal clothes on top. Don't be nude or lewd or you might get arrested. You must act completely normal as if nothing was missing from your bottom half. You should not tell people that this is a flashmob or any other type of coordinated event. Have fun. Photo courtesy of SFFunCheap