So, the concept behind the monthly event Bring Your Own Projector is that you lug your own, um, projector (Super 8, video, whatever) into the basement of the Alibi Room. Then everyone points his or her cinematic treasures at the wall at the same time to produce a wild visual cacophony. The concept of this BYOP theme night is that you bring only fitness videos—homemade or commercial, DVD or VHS—and "excessercise!" Workout gear encouraged. (Alibi Room, 85 Pike St, #410, 632-3180. 8 pm—midnight, free, 21+.)