I recently came by the following bits of Trivia about Jack Nicholson:
Is an avid fan of professional wrestling.
His all-time favorites are Harley Race, Ric Flair, and John Cena.
At one time, wanted to induct Ric Flair into the WWE Hall of Fame.
Once said in an interview that if he can get Jim Carrey, Tom Cruise, Robert Downey Jr, and Johnny Depp to be a part of it, he would start his own wrestling promotion.
Is good friends with George "The Animal" Steele.