You better run from the Rev!

Rap legend Rev Run's teenaged son Joseph Simmons Jr. was arrested tonight for possession of marijuana.

The 19-year old was seen allegedly buying the marijuana and rolling a joint while sitting in a car on Manhattan's Upper West Side. We're told he tried to get away by throwing his car into reverse, and nearly backed into the officer's car.

Simmons Jr, known as JoJo on the MTV reality show "Run's House", was also booked for resisting arrest, attempted reckless endangerment, and criminal use of drug paraphenalia.

There is nothing wrong blazing a time or two... Give him a break!!!