> No-one knows if Hitler bumped into Trotsky, or Tito met Stalin. But works like Dr Freud Will See You Now, Mr Hitler - a 2007 radio play by Laurence Marks and Maurice Gran - are lively imaginings of such encounters.
The other much-argued encounter is that Wittgenstein was a year or two above Herr Schicklgruber in high-school. Obviously Ludwig was Jewish, and far more intelligent than Adolf, so it established a fervent resentment... or not.
Now I want to check this out!