A driver gets stopped by a cop.
Cop: "I'm gonna have to give you an alcohol test, but I forgot to bring the breatho, so we'll just try something different."
Driver: "Fine by me."
Cop: "Imagine you're driving at night, and you're seeing one headlight coming your way. What is that?"
Driver: "Well, it's probably a motorcycle."
Cop: "Be more specific! What sort of motorcycle? Is it a Harley, a Honda, a Yamaha...?"
Driver: "How would I know?"
Cop: "Aha! You're looking pretty drunk to me. Let's be sure. You're driving at night and you're seeing two headlights coming your way. What is that?"
Driver: "It's a car!"
Cop: "Yes, but what kind? Is it a Chevy, a Nissan, a BMW..."
Driver: "How the **** would I know!? I think *YOU'RE* drunk! Let me give you that same test.
Imagine you're driving at night, and you're seeing a half-naked woman standing by the roadside. What is that?"
Cop: "Well, it's probably a hooker."
Driver: "Yes, but which one? ... Your wife, your mother, your daughter...?"