The back room at Western Bridge lately is like the back of the bus: better. This season there is Takeshi Murata's Monster Movie (2005), a four-minute sample of hand-selected frames from Caveman, the 1981 B-movie. In Murata's version, projected at overwhelming silver-screen size, the fight is not between human and toothy monster but monster and screen. The hairy beast rushes the screen, but he always dissolves again. You could feel sorry for him if you didn't want more. (Western Bridge, 3412 Fourth Ave S, 838-7444. Noon–6 pm, free.)