By Sam McManis, The Sacramento Bee, Calif. May 8--Silly me. I thought cable TV news was beyond mocking. After all, once you've watched Nancy Grace in action, parody and satire don't seem to stand a chance. But then along comes The Onion to prove that theory wrong.

NEW YORK - The video was grainy, shaky but undeniably compelling: passengers standing in the aisle of a subway car, its windows shattered following one of the coordinated explosions in London. Several U.S.