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PHILADELPHIA (CBS) — A southern California boy is recovering after a terrifying bounce house accident.

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The inflatable house blew away, with the boy trapped inside.

The bounce house, carrying 9-year-old Seth Olson, landed on a busy highway.

seth olsen 9 Year Old Seth Olson Injured After Flying Out Of Bounce House, Landing On Highway

Credit: (CBS3)

Olson fell out, but he says he blacked out and can’t remember anything.

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The boy’s family says he and others were at a Mother’s Day party when a strong wind gust picked up the inflatable house.