During her hit song "Roaring,” Perry was floating above the crowd on a mechanical butterfly when it suddenly dropped a few ...

The giant butterfly Katy Perry rode on above the San Francisco stage on Friday night malfunctioned, nearly toppling her into the crowd. Perry paused, steadied herself and kept on performing.

Katy Perry was performing Roar at the Chase Centre when the butterfly prop she was riding dropped mid-air, with the crowd gasping in concern ...