Bruce Jenner's oldest son Burt Jenner went nuclear on the paparazzi Thursday ... berating them for screwing with his famous family. Problem is ... most of the photogs didn't know Burt from Adam.
Burt owns a dog sitting business. The paparazzi swarmed Burt's parking lot after getting wind of a big celeb who was inside a building across the street.
The non-famous Jenner was indignant, ordering the photogs -- not ours -- to skedaddle. Their response -- Who the hell are you?
That's all Burt needed to hear. He had his employees get in their car and block the photogs from leaving.
Everyone screamed, had a bad time ... and the video is awesome!