Chinatown is a district in San Francisco. You can get anything if you pay enough for it. Swords, knives, lighters. The Chinese dudes behind the counters will always try to squeeze you money out of you, so deal with them with the word "No."
A place where you can throw firecrackers at old people without getting in much trouble. Its also full of skanky little Chinese restaurants. A lot of weird shit happens in Chinatown.