Often regarded as one of the greatest actors of all time, Robert De Niro was also considered to be one of the most enigmatic. Due to his abhorrence with being interviewed, De Niro had famously remained tight-lipped about his personal life, background, past experiences, opinions about other actors and just about everything else that had nothing to do with acting. Even then, he had sometimes put fear into journalists whenever he was asked about playing Travis Bickle in “Taxi Driver” (1976), going on an eating tour in the south of France to gain 60-pounds for “Raging Bull” (1980) or wearing