But you can't watch that particular parody video now. It's been DMCA'd -- taken down, along with many other Downfall parodies, by a copyright claim from Constantin Film. This is a real shame. There's something fun about watching the crazy-eyed murderous loon having a nervous collapse over modern trifles like balloon boy, Michael Jackson, and MySpace.
But all these parodies are clearly fair use and never should have been removed by YouTube. Luckily, Rocketboom has put together a video explaining how to dispute a YouTube content take down in six easy steps. Hitler will be relieved.