The Furher Himself; Adolf Hitler

According to the book "Killing Hitler: The Plots, the Assassins, and the Dictator Who Cheated Death", there were not 1 or 2 or 3 attempts to kill Hitler. Not 10, not 20, not 30, and not even 40. ...At the very least there were 42 attempts to try and kill the Wolf, the nickname given to Hitler.

All of them failed. Here are a few of them. In early 1932, at Kaiserhoff Hotel, Hitler and some of his staff got sick after a meal.
Apparently the meal was poisoned.
However, because Hitler was a vegetarian he wasn't affected as much.

Just a month later on February 9, Hitler was sent a poison letter by a member of the Bavarian State Parlament, Ludwig Assner. However, it never reached Hitler as a friend of Assner told Hitler and the letter was stopped and intercepted. In December 20, 1936, a Jewish German by the name of Helmut Hirsch is part of a plot to kill Hitler.

 He must take two suitcases with explosives inside to the Nazi headquarters at Nuremburg.

Unfortunately, the Gestapo have a double agent who finds out and Hirsch is killed. In October 5 1939, a Polish general tries to set up over 500 kilograms of TNT to explode when Hitler's victory parade, after his conquest of Poland, starts.
Again, the saboteurs miss their target as the parade is diverted.
All those attempts to kill Hitler? All failed. All in vain.

Only for Hitler to kill himself at the end of the war.

Ironic.