Brad Pitt has become obsessed with "deep-trance spirit channeling".
The 44-year-old actor - who raises six children with partner Angelina Jolie - is said to have become interested in the phenomenon after watching a US TV documentary.
A source said: "Brad is having sort of a midlife crisis. He is asking the big questions, like 'What do I want to do with the rest of my life?'
"He has also taken up deep-trance spirit channeling, trying to commune with ghosts, after watching the documentary 'Tuning In: Spirit Channelers in America'. Angelina is trying to be supportive but is now worried that Brad may become obsessed."
Brad is also said to be keen to explore his hobby in a new movie, but is facing protests from Angelina.
The source added to America's Star magazine: "Brad is looking for a script about channeling, but Angelina is afraid that if he tries to bring it into the mainstream, people will really think he's gone off the deep end."
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