This is not what has happened to me but a picture of Robert Plant reacting to Prince Charles..
The enjoying of a rather dark sense of humour he is talking about on this link must be as written by the Associated Press/Johnny Green.
That Prince Charles explains how he used to enjoy satanic messages while playing "Stairway To Heaven" backward as a teen.
The Led Zeppeling singer was at Buckingham Palace to receive his title of Commander of the British Empire..

Is that spooky or what???
He looks pretty spooked out in this picture..

http://www.guardian.co.uk/music/2009/jul/13/led-zeppelin-robert-plant-cbe