As the person who has posted quotes from Casablanca (on more than one occasion, I think), I could hardly fail to guess the film after your last set of clues. Apart from Bogie, I think Sidney Greenstreet and Peter Lorre were also in both films and there may well have been others. I don't think I ever saw the entire film, although I have watched Casablanca more than once - It's one of those films you can watch over and over again.
Anyway, enough of that. How about this one?
A: Your boss is quite the card player. How does he do it?
B: He cheats!