Two children were carried about 100 metres when a gust of wind tore a bouncy castle from its air compressor and blew it across a field in Colorado.
The incident took place on Saturday at a lacrosse game in Littleton. Witness Desiree Hunter described watching the inflatable structure tumble across the field "like a bag in the wind".
"We saw the wind kicking up and all of a sudden the wind took the jumpy slide with it and we were just horrified," Vanessa Atencio said.
Two 10-year-old children were trapped inside the bouncy castle. Both were slightly injured.
It was the second recent high-profile accident involving a bouncy castle.
Last month in South Glens Fall, New York, two young boys were seriously injured when they fell from an enclosure that had been caught in a wind gust that blew them 15 metres into the air. A young girl was slightly injured in the incident.