Bounce houses are flying away, tipping over, and being improperly put up. A News 8 report showed the bounce house industry, unlike traditional amusement park rides –- is almost entirely unregulated in Texas.

Now a new danger has emerged, one experienced firsthand by 6-year-old Brenna Cromar, whose left leg is now in a cast. "I was jumping in the bounce house," Brenna explains, "And I jumped at the wrong time when Daddy was jumping up."

"I got in there, jumped one time," adds Brenna's father, Brad, "And heard the scream."

"It hurt very bad," said Brenna.

The Cromars thought Brenna's broken leg, that she got during a birthday party last Saturday, was a freak accident. Then they spoke to the orthopedic specialist.

"The doctor told me that this is happening all the time," says Teresa Cromar, Brenna's mother, "Because they're putting teenagers and adults in with the smaller kids."

"Adults on inflatable amusements are banned in about 60-different countries," says John Newton, owner of Jumping J-Jays Castles & Slides. "And in America, it's still ok to do it."

Newton began his bounce house business in his home country of Australia, where federal regulations regarding jumping castles are strict. Adults in Australia and all of Europe are outright banned.

One reason: the heavier the person, the more air pressure is displaced. So, the side a much lighter child bounces on -- becomes hard.

"They just won't land right," explains Newton. "Next then you know, the ankles are moving out from each other, next thing you know, the knees are giving way, and I can tell you, in most instances a lot of adults hurt themselves."

Newton says he doesn't allow anyone over 12 to jump on his bounce houses, because of the weight distribution issue. He believes safety laws should be written in Texas and nationwide. As do the Cromars, now.

"I would never risk their health," says Brad Cromar, "Just for a few minutes of fun."

In many cases, insurance isn't required for bounce house rental companies. So, if an injury or death happens, it's considered the bouncer or homeowner's responsibility.

E-mail jstjames@wfaa.com