Some comics just want to entertain us with lighthearted, giggly riffs on everyday life. But others prefer rattling the cultural cage. They bodaciously amuse or appall us with their gleefully indecorous rants on contentious political and social issues and personalities. It's no secret that Whoopi Goldberg has always been one of those other comics, an unabashedly provocative prankster. So jump back. Whoopi's getting ready to wail again.