Jodorowsky's Dune Uncovered
Scene 29-30 : The Emperor's Upside-Down Room
Leto slides down into a luxurious room, built upside down.
The Emperor, doing most of the talking, tells Leto : "If you say I'm a spice smuggler, and I say you're a liar just out for power, who are they going to believe ?"
The room being to revolve and Leto first has to walk from wall to ceiling before the room spins faster and faster, and Leto is thrown out.
In the Moebius boards seemingly Leto lands straight back into the Senate, but in the script Leto is ejected through the clown's bottom and Count Fenring tells him that the Emperor will give the Atreides satisfaction in front of the whole Senate the next day.