Most bands' idea of a mixed media show is wearing hand-painted tee shirts from their girlfriends, which is why the Hypnotwists' sensory assault never meets with a mixed reception. Holed up at the Emerald Lounge on Wednesday nights, the band has turned the place into one of those sweaty Swinging '60s nightclubs where Terence Stamp might walk in and meet Julie Christie. Of course, Terry and Julie wouldn't be caught dead here, but chances are they might turn up in a movie projected on the stage: The Hypnotwists seem to favor black-and-white movies where people shag standing up. What ties all the swirling colored lights together is the band's music, a blend of garage, surf and soundtracks that keeps folks on the dance floor even when breathing space is a limited commodity. People dancing at a local rock show? These guys have really built the better time machine.