Of course it depends who you're flying with, and whether they're feeling chatty or not.
I was always worried if I ended up with a skipper that was a man of few words that it'd be a bit like sitting with your girlfriend's dad for the first time or something, all stilted conversation et al but to be honest it's not like that really.
There's a sense of purpose with every flight and you're working as a team, so there's always some common ground for chat. And like was pointed out above, there's always the Times crossword, which I might add, is aided no end by flying a 'bus.....
*runs for cover as a new 'Times Crossword Airbus Vs Boeing fight breaks out*