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Manager at jump at gym. >> this bounce house is like a kooit or sail if it's not properly secured, the wind will tip it over. this one is not properly insecured and it's easy for air to lift it up and flip it over. >> if kids are inside that's dangerous. >> they can fall out and get hurt very seriously. >> reporter: he says the best advice something so many of us forget lock the bounce house down. how do you stake this in so it's safe? >> first get the right stake, at least an 18 inch stake, keep it on a 45 degree angle, go as much as you can -- >> you don't even see it anymore. >> right. >> r...

Other accidents caught on camera. >> there's not a kid in there, is there? >> reporter: in colorado last year two kids were hurt when high winds sent this bounce house tumbling. 2011, 13 people were hurt when it happened on long island. and remember this from upstate new york? two kids seriously injured when wind sent them airborne. they fell out, plummeting 20 feet to the ground. dan stuckey is the general manager of jump and jam, a safety certified bounce house company. >> this wall right here of the bounce house it's like i kite or a sail. if not properly secured, it could take the wind win...