The 7-year-old underwent emergency open-heart surgery after one of several drones that fell from the sky and struck him in the chest and mouth.

What was intended to be a dazzling festive spectacle ended in injury to a 7-year-old boy after several drones unexpectedly fell from the sky during a show in Florida on Saturday night, according to CNN affiliate reports.

A holiday drone show in Orlando’s Lake Eola Park became a nightmare for many when the unmanned aerial vehicles started malfunctioning.