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Jump & amp; Smile is a kind of fairground ride in which the car seat is arranged on a number of radial arms around the central axis. As the central axle rotates, the arms are lifted into the air at a pseudo-random interval giving an uncertain leaping motion. There is another version called Techno Jump, which has a special pattern in which the car will go up one by one, and then shake slightly when it goes up. Then the vehicle suddenly falls up and down, creating the illusion of the moving waves and the "ch-ch-ch-ch-ch-ch" piston sound. Also these rides will freeze in the air, making the rider think it's over before starting to do the same jumping motion backwards.
Source of the article : Wikipedia
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