Are you a fan of Marlon Brando's? 
You bet. He's one of the greatest actor's in the world!
What is your favorite film of his? 
It might not be original, but I would have to say The Godfather. It came out 50 years ago and it's still better than most movies today.
I will be honest and say that while I love The Godfather, my favorite Brando film is probably Guys and Dolls. It's so different than anything else he did, really, and he sang so well in it. 
You know, I actually haven't seen that one. Is that the movie about the gambler going to Havana?
That's part of it. Basically, two gamblers make a bet about one of them being able to take a Salvation Army soldier to Havana on a date. Frank Sinatra and Marlon Brando are the two gamblers. 
Oh, and Frank Sinatra is in it? I'm already sold, I need to check it out!
He's wonderful in it too. He has some great musical numbers. Adelaide is a great love ballad that he does. 
Already added it to my watchlist. Any other Marlon Brando movies you might recommend that aren't too mainstream?
Well, A Streetcar Named Desire was of course one of his very best films but I think not a lot of people have seen it because its a much older movie. He's amazing in it/