[ WP ] Hitler is getting tired of time travellers coming to assassinate him , so he travels forward in time to kill the inventor of the time machine , who travels back in time to kill Hitler .

`` I have traveled from the future to assassinate you for crimes you will commit against humanity, Adolf Hitler.'' 
 
 `` Another one? These are getting more common by the day, it seems like. Well, let's get this over with.'' 
 
 The assassin, either a very strictly adherent rabbi or someone who thought it would be funny to kill Hitler dressed as a rabbi, did n't speak German and had no clue what Hitler said. Without missing a beat, he drew his unidentifiable futuristic weapon, pointed it at Hitler, and pulled the trigger. The instant Hitler was killed, the time traveler had created the classic paradox of going back in time to do a specific thing, which then leads to there being no reason to go back in time in the future, which leads to the reason for going back unfulfilled, and so on. What most people do n't realize is that creating such a paradox does n't implode the universe or cause a black hole to form. You see, the universe has a simple fix for such paradoxical events: *it* moves time back. So, as Hitler was killed, the universe moved time backward a few instants, but this time the time traveling murderous rabbi or rabbi impersonator disappeared in a puff of smoke. Perhaps the universe erased him from ever existing. Perhaps it teleported him to a far-away Galaxy. Perhaps it moved him further in time to the dinosaurs or something. The specifics really are n't important 
 
 Hitler, of course, had no idea any of this was happening, all he knew was that several times a day people would travel back in time, try to kill him, then disappear in a puff of smoke. It was really nothing more than a mild annoyance, but Hitler had better things to be doing. 
 
 So, sometime later when he was already Chancellor, he decided to put an end to the mild annoyance of inevitably failing time travel assassination attempts. The best plan he could think of ( and you have to remember he was already busy fighting a war and trying to commit genicide *and* he was being interrupted every so often by time traveling assassins ) was to steal one of their time machines and travel forward in time to when the time machine was invented and stop the inventor from inventing it. 
 
 So, inevitably, another assassin came, but this time the gestapo grabbed him before he could be disposed of by the universe for creating a paradox and was interrogated for the following pieces of information: where his time machine currently was, when the time machine was invented, and what events in the future were a must-see for a 1940s political leader. The man surrendered the first two pieces of information, but refused to help Hitler seek any enjoyment in his time traveling quest, so he did not give up the third. 
 
 Satisfied with the interrogation, Hitler, not wanting to pass up on the opputunity to travel forward in time, went to the time right before the invention of the time machine himself instead of sending a proxy. Once there, he killed the inventor, but unknowingly gave a lab assistant the idea to finish his mentor's project, thus making him the new creator of the time machine. Hitler then went back in time to right after the time he left, feeling accomplished. 
 
 The man now known as the inventor of the time machine ( formerly known as the lab assistant of the man who invented the time machine ) decided that Hitler would inevitably realize that the time machine had still been invented at essentiLly the same time and would most likely travel into the future to kill him ( the new inventor ), so he had no choice but to travel back in time to kill Hitler. 
 
 Unfortunately, he did not have as strong a grasp of the entire concept as the former inventor, so he did not realize that by doing so he would create a paradox. He did, however, have a great since of humor and decided that it would be funny to kill Hitler dressed as a rabbi. 

