My father made him an offer he couldn't refuse
In Sicily, women are more dangerous than shotguns.
Don Vito Corleone: What have I ever done to make you treat me so disrespectfully? If you'd come to me in friendship, then this scum that ruined your daughter would be suffering this very day. And if by chance an honest man like yourself should make enemies, then they would become my enemies. And then they would fear you.
Bonasera: I believe in America. America has made my fortune. And I raised my daughter in the American fashion. I gave her freedom, but -- I taught her never to dishonor her family. She found a boyfriend; not an Italian. She went to the movies with him; she stayed out late. I didn't protest. Two months ago, he took her for a drive, with another boyfriend. They made her drink whiskey. And then they tried to take advantage of her.
Michael Corleone: Well, when Johnny was first starting out, he was signed to this personal service contract; with a big band leader. And as his career got better and better, he wanted to get out of it. Now, Johnny is my father's godson. And my father went to see this band leader, and he offered him $10,000 to let Johnny go. But the band leader said no. So the next day, my father went to see him; only this time with Luca Brasi. And within an hour, he signed a release, for a certified check for $1,000.
Kay Adams: How'd he do that?
Michael: My father made him an offer he couldn't refuse.
Kay: What was that?
Michael: Luca Brasi held a gun to his head, and my father assured him that either his brains or his signature would be on the contract. That's a true story. That's my family, Kay. It's not me.
Don Corleone: I understand. You found paradise in America. You had a good trade, made a good living, the police protected you and there were courts of law and you didn't need a friend like me. But, now you come to me and you say 'Don Corleone, give me justice.' But you don't ask with respect. You don't offer friendship. You don't even think to call me Godfather. Instead, you come into my home on the day my daughter's to be married and you ask me to do murder for money.