For all the special little sadists out there with an artful eye, something old and something new: A Clockwork Orange is playing at the Red Vic on Friday, Sept. 5; call 668-3994. It's still banned in Britain, and if you haven't seen it on the big screen, it's well worth it. This World, Then the Fireworks is in its final two days (Wednesday and Thursday, Sept. 3 and 4) at the Roxie; call 863-1087. This is Jim Thompson, folks -- rape and incest fantasies, eyeball skewerings, orgasmic brain hemorrhages. You get it all for $6.50.