The Movie: The classic dystopian sci-fi Blade Runner
The Tough Guy: Brion James as the Replicant thug Leon
The Situation: After chasing Rachael (Sean Young) through the rain-drenched futuristic Los Angeles streets, Deckard (Harrison Ford) runs into Replicant Leon who pulls him against a car and proceeds to rough him up. Just before Leon is about to kill Deckard, Leon drops this infamous line (later to be replicated by Rutger Hauer at the movie's end) only moments before being smoked by Replicant Rachael himself.
What Makes It So Tough: James' exceptionally disturbing reading of the line is what landed it in the annals of movie history. He sounds like the world's most deadly alarm clock. More than that, there's a certain bloodthirstiness there. Leon doesn't even want to give Deckard the benefit of dying in his sleep. He wants him wide awake and lucid when he lays down that final blow.