But economics does not excuse ethics. Downfall is available on legitimate platforms like MUBI, Amazon Prime (rental), and iTunes. The "Filmyzilla" search is a choice—the choice of convenience over legality.
If you want to experience the intensity of Downfall with the best possible picture and sound, there are several legitimate avenues: downfall 2004 filmyzilla
The specific scene (known as the "Original Untergang Scene") involves Hitler realizing that his generals have failed him and the war is lost. While the memes are funny, they actually do a disservice to the power of the scene. In the full context of the movie, it is a terrifying moment of a tyrant completely losing touch with reality. But economics does not excuse ethics