PULP FICTION star Samuel L Jackson has turned from being the movie world's most outspoken critic of acting rappers to their mentor.

The actor has often voiced his distaste for rappers who think they can become movie stars by simply signing a film contract.

But, after getting praise from Ice Cube for his fatherly advice on the set of XXX2: STATE OF THE UNION, Jackson has now become David Banner's hero after working with the rapper on the set of new movie BLACK SNAKE MOAN.

Banner reveals, "Samuel L Jackson took me under his arm and said, 'Now, I'm gonna help you do this actor thing. You gotta take it serious, you gotta make me proud of you,' so I've been working hard."