HAPPY: He stops at a green light and then it turns red and he goes. (He laughs.)
BIFF: Maybe he’s color-blind.
HAPPY: Pop? Why he’s got the finest eye for color in the business. You know that.

– Arthur Miller

Death of a Salesman, Act 1. Happy and Biff joke about their father’s growing mental instability. Making light of Willy’s bad driving, his unsympathic sons prefer to see the funny side of his inability to see reality rather than the danger. This passage is full of irony and foreshadowing of Willy’s suicide by car crash.