Best known for his uncanny impersonations of Bill Clinton, Al Gore and Dick Cheney, Saturday Night Live star Darrell Hammond has revealed the dark truth behind his comedy persona, RadarOnline.com has learned.

The funny man details his downward spiral in a disturbing new tell-all book in which he relates how he drank and did cocaine while with the show and was once taken from NBC “in a straitjacket," reported the New York Post.

“I kept a pint of Remy in my desk at work,” Hammond revealed in his memoir God, If You’re Not Up There, I’m F**ked, that will be published on November 8.