The movie stars Samuel L Jackson as John Shaft, the nephew of the original John Shaft (1971). John Shaft investigates a racially motivated murder committed by Walter Wade (Christian Bale), the son of a wealthy tycoon and has to fight off corrupt officers in order to bring Wade to justice. Shaft's most powerful weapon is his mouth and the expletives he shoots out from it (ha!ha!) - who else but Samuel L Jackson can carry it off. He did it again in "Snakes on a Plane (2006)".
Stick on the afro and he can be Jules Winnfield, the contract killer from "Pulp Fiction (1994)"