Withnail and I
I can't even think about the bit where Withnail goes fishing with a shotgun without p1551ng myself laughing!
For a "to the point" rejoinder, I always rather liked:
Josey Wales: You a bounty hunter?
Bounty Hunter: A man has to do something these days to earn a living.
Josey Wales: Dyin' ain't much of a living boy