Carolyn Spangler, 14, left, and Dawn Woodard, 13, both of Arlington, Texas, let their feelings be known as they speed through the first of two 360-degree loops in the new Shock Wave roller coaster at Six Flags Over Texas in Arlington, April 24, 1978. A large crowd waited hours on the opening day of the ride to make the two-minute trip on the hair-raiser. The roller coaster track is at lower right and autos roll by on interstate 30 at the left. (AP Photo/Pete Leabo)