Real Housewives Star Assaults Homeless Man

The video was shot in South Beach Monday night -- you can see Peter looking into the camera, and introduce the "prank" by saying, "Punching a hobo in the nuts."

Peter then walks up to a sleeping homeless man and tells him, "I was gonna give you five dollars" ... before dropping his fist into the man's crotch.

Peter and his cameraman then run to a nearby car and make their escape.