While shooting a pivotal scene the Lord of the Rings films, Christopher Lee (who served as a spy/assassin in WW2) schools Peter Jackson during a scene.
"When I was shooting the stabbing shot with Christopher, as a director would I was explaining to him what he should do"... "And he says, 'Peter, have you ever heard the sound a man makes when he’s stabbed in the back?' And I said, 'Um, no.' And he says 'Well, I have, and I know what to do.' "
According to The Guardian, "Lee is said to have assisted the UN's War Crimes Commission and Allied governments in tracing those suspected of Nazi war crimes. He joined the RAAF at the beginning of the war, and also worked for British Intelligence."
He also recorded a heavy metal album at the age of 86:
"Lee's musical career took a metal turn. He released a "symphonic metal" album, Charlemagne: By the Sword and the Cross in 2010. It won him a spirit of metal award at the 2010 Metal Hammer Golden Gods ceremony. He claimed to be descended from Charlemagne."