AFI #051 Clint Eastwood as Harry Callahan from Dirty Harry (1971)

Callahan: I know what you're thinkin', punk. You're thinkin' did he fire six shots or only five? Now to tell you the truth, I've forgotten myself in all this excitement. But bein' this is a .44 Magnum, the most powerful handgun in the world, and it'll blow your head clean off, You've got to ask yourself one question: 'Do I feel lucky?' Well, do ya, punk?

- Clint Eastwood as Harry Callahan from Dirty Harry (1971)

The bolded line is ranked #51 in the American Film Institute's list of the top 100 movie quotations in American cinema.