In May 2011, two teenagers were seriously injured in an amusement ride at a school fair. The two, a brother and sister, fell almost 15 feet when they were thrown from a Zipper ride, which is similar to a Ferris wheel, but with cars that flip around. The accident occurred when the two attempted to get off the ride but the ride actually went into motion again. According to the Times-Picayune (05/15/11), the two were airlifted to the hospital. Officials are investigating the incident.
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In April, a jumping castle was blown across three lanes of traffic before landing on the median of a highway in Arizona. A boy and girl who were in the castle when the incident occurred were taken to the hospital with serious injuries.
According to NBC News (06/08/11), federal officials report around 6,000 injuries annually involving bounce houses and similar structures. In many cases, the injuries involve horseplay or children landing on each other causing broken bones. But in some cases, those injuries are caused by the structures blowing away in the wind.
Bounce house manufacturers say that if the wind gets up to 20 miles per hour, regardless of how well tied down the houses are, they should be shut down.