The Hitler will scene is a Downfall scene sometimes used in parodies.
The scene begins with Traudl in bed, waking up, realizing she had fell asleep. After she dresses, she goes downstairs and passes a corridor, where many officers and soldiers are talking. She meets Hitler and apologies for being late. They sit in a nearby room, where Traudl opens a box revealing a typewriter. Hitler then begins dictating his political testament.
Hitler finishes dictating his testament to Traudl, by speaking of the International Jewry, to which she looks at him shocked. Hitler looks back and she finishes the sentence.
The scene in the extended edition differs a little, it features Traudl stops by at the Goebbels children's room before going to Hitler.
In Downfall Parodies
The scene has been used in several parodies. Truckman is one of the Untergangers who used the scene. It was also used in JennieParker87's A strange parody 1. The mondegreen "Mindfuck" also comes from this parody/scene.