i generally have a pretty safe 5 mile bike ride home from work but tonight was rather testy. on valencia street at 15th st i was almost attacked. needless to say that i got away safely by speeding up and moving into the car lane whilst yelling stop and holding my u-lock as a defense weapon against the attacker. i just have never had an experience like that before and i'm wondering if other bicycling commuting women in the city or anywhere else has had a similar experience? and how do you defend yourself from such an attack while on bike?