On Friday night, thousands of costumed San Franciscans descended on Mission Playground to dance to loud music, flirt and drink hard seltzers. In addition to your typical vampires and ghosts, transportation-minded San Franciscans showed up as Muni buses, BART cars and even Waymos ( RIP KitKat). The unsanctioned Halloween party, known as DanceOWeen, distills some of San Francisco's best traits: a love of music, a fixation with unsexy costumes and a willingness to flaunt permitting requirements, city agencies be damned.