A tourist from a pastoral country was waiting at a traffic junction to cross the road in Singapore. He asked a local guy, "Sir, shall I cross the road when the red man is lighted, or when the green man is lighted?"
Singaporean: "So long as there is no traffic, cross the road. Never mind whether green man or red man. But when you see the blue man, do not cross."
Tourist (looking puzzled): "But Sir, there is only a red man and green man on the traffic light. Where's the blue man?"
Singaporean (pointing to a blue-uniformed policeman)
"There...that's the blue man. If you see him, you better don't cross anyhow!"