Inspired by this BBC article: http://news.bbc.co.uk/1/hi/magazine/8617454.stm this evening I found these: http://www.youtube.com/results?search_query=downfall+parody&aq=0
Made my day after a hideous one at work - bit of light relief & all that! 8)
IIRC it began with a Dutch comedy show actually dubbing the lines, making it so that Hitler wants to go bowling, but that's not the liking of the others ... Rather than dubbing, people started to sub the original, which works fine, but if you understand German the joke doesn't work that well.