A group of thrill-seekers likely got more than they bargained for at a theme park after riders were left stranded on a roller coaster for hours. Two dozen riders were stuck when the Joker's Jinx stalled with riders some 100 feet in the air at Six Flags America in Maryland. The riders, some as young as 9, according to local reports, were stuck at an awkward angle and had to be ferried down individually by rescuers using a crane's hydraulic arm.