The police finally catch a cunning art thief, but they can't figure out why he took a famous painting of Water Lilies.
The thief turns out to be a kid with a personality disorder. A criminal psychologist takes hours and hours talking to the kid.
He finally comes out and tells the captain, "The kid has a severe disorder. His inner consciousness was channeling the collective unconscious. He takes on the personalities of German psychologists and gets a compulsion to steal."
Captain says "That's fine but I still don't understand."
Psychologist "Well, to put it into layman's terms.......He was Jung, and he needed the Monet."