Leonardo DiCaprio admits that he didn't hear much about the famously feared J. Edgar Hoover while he was growing up. That doesn't stop him from making an astute observation: "The man was a troll."

He laughs as he continues: "You know how some people resemble certain breeds of dog? Well, Hoover definitely looked like a bulldog."

Cut DiCaprio some slack; the 37-year-old actor was born after Hoover's tenure as head of the FBI from 1935-1972 and he spent a reported five hours in the makeup chair most days to try and physically resemble the man in "J. Edgar," a film based on Hoover's life.