Caligula: Imperial Edition (Penthouse) (Spoiler alert: Fisting!) One day back in the swingin’ ’70s, somebody mentioned how “absolute power corrupts absolutely,” and then Bob Guccione, Gore Vidal, Malcolm McDowell, Helen Mirren and Peter O’Toole said, “Let’s make a big-budget movie about that, with come shots.” And Caligula was born. Actually,…