Bieber Bungee Jump -- The Mystery Scream

4/28/2010 12:10 PM PDT

Justin Bieber Bungee Jumps

Justin Bieber hung off the side of a bridge in New Zealand yesterday -- seemingly fearless as he prepared for his big bungee jump. He was brave, he was tough ... except for one little thing  ...

Somebody screamed like a 5-year-old girl as Justin made his descent ... and the scream seemed to fade as Justin seemed to plummet further from the bridge.

It's possible that it could have been someone else ... but even if it was The Bieb -- props for having the cojones to get up there and jump in the first place.