Sonny: You give her my test. You give her the door test.
C: What’s the door test?
Sonny: Before you get out of the car, you lock both doors. You get out of the car, you walk over to her. You bring her over to the car, take out the key, put in the lock, open the door for her. Then you let her get in, then you close the door for her. Then you walk around the back of the car and you look through the rear window. If she doesn’t reach over and lift up that button for you, so you can get in, dump her.
C: Just like that?
Sonny: Listen to me, kid, if she doesn’t reach over and lift up that button for you, so you can get in, that means she’s a selfish broad and all you’re seeing is the tip of the iceberg. You dump her and dump her fast.
I’m not mad, I’m proud of you. You took your first pinch like a man and you learn two great things in your life. Look at me, never rat on your friends and always keep your mouth shut - Goodfellas (1990)