Two men who say they were barred from riding a roller coaster at Universal Studios Hollywood because they are missing limbs have sued the theme park. Angel Castelan, whose forearms were amputated after an electrical accident as a child, and Marvin Huezo, whose legs were amputated after a car accident, say they were kept off Revenge of the Mummy: The Ride, an indoor roller coaster. The suit, filed last month in U.S. District Court in Los Angeles, contends the men were kept off the ride in violation of the Americans with Disabilities Act.