This one has drawn some laughs in some social gatherings I've been part of. It is from Robert DeNiro when he played as Al Capone in The Untouchables:
I'm gonna tell you something: somebody messes with me, I'm gonna mess with him. Somebody steals from me, I'm gonna say: YOU stole! Not talk to them for spitting on the sidewalk. Oh... One more thing: you get an all-out prize fight, you wait till the fight's over, one guy's left standing, that's how you know who's won
_________________
If "manners maketh man" as someone said
Then he's the hero of the day
It takes a man to suffer ignorance and smile
Be yourself no matter what they say
**Sting, Englishman In New York