Josh Brolin -- I'm Never Drinking Again

Josh Brolin says he's done drinking alcohol for good ... after Friday night's cabbie-raging bouncer-fighting debauchery.

We posted both videos over the weekend -- one showing Josh fighting with a cab driver after he rear-ended the guy, and the other showing Josh drunkenly fighting a bouncer for trying to move him outside a bar.

Now it appears Josh has learned his lesson, telling a photog today that this kind of nonsense will never happen again.