Movies:
Blade Runner

Joe Turkel as Dr. Eldon Tyrell: "The light that burns twice as bright burns half as long."

(Thanks, Ian.)

Sean Young as Rachael: "I'm not in the business... I am the business."

Morgan Paull as Holden: "You look down and you see a tortoise, Leon. It's crawling towards you..."

Brion James as Leon (interrupting): "Tortoise? What's that?"

Paull: "Know what a turtle is?"

James: " 'Course."

Paull: "Same thing."

James: "Never seen a turtle."

(Thanks, Ian.)

Rutger Hauer as Roy, speaking to Harrison Ford: "I've... seen things you people wouldn't believe."

Edward James Olmos as Gaff: "It's too bad she won't live... But then again, who does?"