An ominous sign hangs outside the Shell Station in Georgetown at the corner of Michigan and Corson that reads "fried chicken and jo jos 24 hours a day." You can imagine what Shell fried chicken served 24/7 would taste like. Actually, no, you can't. The fried chicken here isn't just passable, it can hold its own against the Colonel and Ezell's. Plus they serve it at 2 a.m., something the aforementioned fry legends don't dare do in the south end. CHRIS KORNELIS 6200 Corson Ave. S.W.