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Screw Two-Face: The Flip Side and the Joker’s Jinx (pictured). When amusement park historians Arwen Mohun and Robert Friedel bring their “Inventing the Scream Machine” lecture to Six Flags America (previously Adventure World, previously Wild World), the pair of danger junkies will focus on these two new roller coasters, the latest entries in the worldwide mine-is-bigger-than-yours thrill-ride sprint. But before the money-stuffed suits at Six Flags took over the controls at the Largo, Md., theme park this year, the biggest and best coasters in the D.C. area were also two of the biggest and best (yet sadly underrated and underutilized) on the East Coast: Roar, a hellish wooden throwback with stomach-swirling turns, and the Mind Eraser, a menacing mess of twisted metal and constant corkscrews. Tight and relentless rides, these coasters brought crime-plagued Adventure World some long-overdue positive publicity—and finally gave area thrill-seekers an amusement option closer than crowd-choked Kings Dominion. So when Two Face and the Joker’s Jinx are sporting long, sweaty waits, give a quick thanks to the coaster gods and break into a jolly run for Roar and the Mind Eraser. You won’t be sorry. The bus departs at 8 a.m. Saturday, July 10, from the National Museum of American History, 14th & Constitution Ave. NW. $19. For reservations call (202) 357-1593. (Sean Daly)