Ryan O'Neal ARRESTED

Ryan O'Neal was arrested on Saturday morning for charges of assault with a deadly weapon and negligant discharge of a firearm...and all the charges resulted in an altercation with his 42-year-old son Griffin! Apparently, a shot was fired, but no one seems to know exactly what caused the ruckus.

His son has been in trouble in the past, after he was found guilty for causing the boating accident that killed the son of Francis Ford Coppola in 1986. And he's also pled no contest to a charge that he shot at his then-girlfriend's car in 1992, after when he completed a stint in rehab. Maybe going nuts with guns runs in the family.

O'Neal was released after posting $50,000 bail. Ryan's mug courtesy of TMZ.