When news about the no same-day reentry policy began circulating around the Web a few days ago, most people (including me) shrugged it off as a foolish rumor. Wendy Goldberg, Six Flags' new senior VP of communications, says it's no joke, however. If you leave any of the parks this year, don't expect to return that day. And don't let the exit gate hit you in the rear end on the way out.