A Clockwork Orange, Stanley Kubrick, 1971

Protagonist Alex is an "ultraviolent" youth in futuristic Britain. As with all luck, his eventually runs out and he's arrested and convicted of murder and rape. While in prison, Alex learns of an experimental program in which convicts are programed to detest violence. If he goes through the program his sentence will be reduced and he will be back on the streets sooner than expected. But Alex's ordeals are far from over once he hits the mean streets of Britain that he had a hand in creating. 

The Shining, Stanley Kubrick, 1980

Jack Torrance: Wendy, let me explain something to you. Whenever you come in here and interrupt me, you're breaking my concentration. You're distracting me. And it will then take me time to get back to where I was. You understand? 

Wendy Torrance: Yeah. 

Jack Torrance: Now, we're going to make a new rule. When you come in here and you hear me typing 

[types] 

Jack Torrance: or whether you DON'T hear me typing, or whatever the FUCK you hear me doing; when I'm in here, it means that I am working, THAT means don't come in. Now, do you think you can handle that? 

Wendy Torrance: Yeah. 

Jack Torrance: Good. Now why don't you start right now and get the fuck out of here? Hm?