German author wrote a novel in which Hitler wakes up in modern Berlin

Er ist wieder da loosely translated as “He’s Back” or “Look Who’s Back”) is a bestselling German satirical novel about Adolf Hitler, by Timur Vermes, published in 2012 by Eichborn Verlag.

In 2011, Adolf Hitler wakes up in a vacant lot in Berlin, with no memory of anything that happened after 1945. Homeless and destitute, he interprets everything he sees in 2011 from a Nazi perspective (for instance, he assumes that Turks in Germany are an indicator of Karl Dönitz having persuaded Turkey to join the Axis, and thinks that Wikipedia is named for “Wikinger”) — and although everyone recognizes him, nobody believes that he is Hitler; instead, they think he is either a comedian, or a method actor. As a result, videos of his angry rants become hugely successful on YouTube, and he achieves modern celebrity status as a performer.