Anthony Hopkins became so hooked on alcohol he suffered severe hallucinations.
The Oscar winner has been clean and sober for 30 years after battling alcoholism.
During darker times, in the early 1970s, Hopkins developed a particular penchant for strong Mexican spirit tequila - which stirred up strange side-effects.
He says: "I was really sort of on a prolonged acid trip. I saw things and had peculiar quasi-religious experiences.
"I thought I was John The Baptist, and I would talk to the sea at Malibu and the sea would talk back to me. It was weird."