The fact that John Barrymore turned in such great performances throughout his film career becomes even more impressive when one remembers that he was partying like the proverbial Rock Star the whole time, raising the devil with his frequent drinking buddies W.C. Fields and Errol Flynn. It seems that this lifestyle caused trouble for him as early as 1933, as he apparently had such difficulty remembering his lines that he resorted to using cue-cards placed off camera and around the set -- of course, the guy is so good at what he does that it's impossible to tell.
On and off the screen, John Barrymore is one of my favorite actors. He had talent that I can only dream of having, and maintained a lifestyle that I can only dream of emulating. To put it simply, John Barrymore: a pretty cool guy.