The scene where Hitler instructs Günsche about the course of action after his suicide is one of the scenes in Downfall that occasionally found use in parodies. Together with the previous scene it's also known as the Bunker Scene 4.
After hearing the 9th Army is surrounded and the 12th Army is unable to continue attacking, Hitler and Günsche enter the hall together, leaving the other generals in the room. Hitler tells his adjutant that he and his wife are going to commit suicide and that the Russians may not expose the corpse of his body. He wishes to be cremated and never to be found. After a short pause, he looks up to Günsche, grasps his chest with his right hand and asks him to promise him to direct his suicide. Günsche replies that despite it is a terrible order, he will carry it out. Satisfied, Hitler gently pats Günsche on the chest twice and went into his study room.
After Hitler closed the door behind him, Günsche instantly set to work on carrying out the order. He walks to the room where Rochus Misch operates the bunker's telephone switch and requests him to take a phone call. Meanwhile, in the Reich Chancellery garage, Erich Kempka answers the phone. Günsche tells him that he needs 200 liters of petrol. Surprised, Erich asks where to get so much gas from. Günsche replies saying to take them from the parked cars in the garage. Erich asks for what Günsche needs all the petrol, at which he replies he can't tell this by phone.
The part used most in this scene is the one where Hitler talks to Günsche, most notably the part where Hitler puts his hand on Günsche's chest, used in parodies like in PunchOfJustice's parody, Hitler's Secret Hobby, where Günsche finds out Hitler's hobby. It's also been used in other parodies as well.
The other part where Günsche calls Kempka on the phone has been used in many parodies, like Hitler Rants Parodies' The Assassination of Hitler parts 1 and 8, Blackbriarshaw's parody, and Günsche Leaves the Führer :(, where the Führer calls Günsche to come back, but he doesn't want to.