Michael: ...Well when Johnny was first starting out, he was signed to this 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. My father went to see the bandleader, with a contract for $10,000 to let Johnny go, but the bandleader said no. So the next day, my father went to see the bandleader again, only this time with Luca Brasi. Within an hour, the bandleader signed the release, with a certified check of $1000.
Kay Adams: How did he do that?
Michael: My father made him an offer he couldn't refuse.
Kay Adams: What was it?
Michael: Luca Brasi held a gun to his head, and my father assured the bandleader, that either his signature or his brains would be on the contract.
The Godfather (1972)