BUSH BASHING PIG HITS MADISON SQUARE GARDEN Sun Sep 17 2006 18:53:38 ET ROGER WATERS [PINK FLOYD] CONCERT TOUR HITS NORTH AMERICA AND NYC WITH FLYING PIGS, URGING DEM VOTES IN ELECTION, 'IMPEACH BUSH' WRITTEN ON REAR OF PIG FLOATING OVER AUDIENCE... One concertgoer writes: 'Seeing Bush's name written across the pig's arse made me howl'... The pig had graffiti. 'New Yorkers/Don't be led to the slaughter/Vote November 7'... another attendee played off the hit 'Another Brick in the Wall': ''We don't need no thought control,' even from Mr. Waters'... Another sends a review: 'I attended the Roger Waters 9/15...