Jersey Shore Cast Member Quits?

As TMZ first reported, Vinny bolted from the house after fighting with another cast member ... and made a beeline for home in Staten Island.

In the video, you see Vinny hop in a cab and drive away ... all while an MTV cameraman films from just a few feet away. As you can see, Pauly D was with Vinny at one point as he loaded up the cab to leave.