Hitler's Downfall is pretty much what you would expect from a forced meme. This is an attempt to make something unhumorous, humorous on the web. It uses scene from a movie called "The Downfall", which also coincidentally comes from a German movie company. They use unhumorous subtitles to make people laugh which ultimately fails. People forcing these meme's are usually called "Bros". They are quite various and can occasionally appeal to people in similar situations.