Jodorowsky's Dune Uncovered
Scene 132-137 : Paul Takes the Water of Life
Fremen fill a cave watching a small worm being drowned to produce the Water of Life. Jessica hands the Water to Paul, warning him that no man has passed this test, but if he is successful he will be the prophet.
Paul drinks in large gulps, and after a few moments of pain Paul announces he has transformed the poison. He kisses Jessica to share the transformed Water and we see their shared vision of the Universe, traveling towards the centre of blinding light, the forbidden place. Paul's face breaks into pieces revealing the face of Leto.
Back in the cave Paul stands before the Fremen and proclaims that he is Paul Muad'Dib, Lisan Al Gaib, the Kwisatz Haderach! Paul's speech convinces the Fremen, and they draw their Crysknives, utter war cries and run into the desert screaming their religious fervour.
They are joined by thousands of Fremen from across the desert, joining the crusade.
The Moebius storyboards that show Paul after he has taken the Water of Life are a lot more theatrical. Instead of Paul just standing before the Fremen we have smoke rising and then spreading out among the Fremen (compared to the end of Raiders of the Lost Ark in the documentary) before Paul himself levitates!