Once upon a time there was a little red man...

...who lived in a little red house and grew little red tomatoes in his little red yard.
One day, while having a bath, there came a knock at the little red door. The little red man got out of the little red bathtub, put on a little red towel and answered the little red door. Why, it was his friend, the little blue lady! So surprised he was to see his friend that his little red hand slipped from the little red towel and it dropped to the floor. The little blue lady was shocked. She screamed, ran down the little red path, past the little red picked fence and got killed by a truck.
Moral of the story: Don't cross the road if the little red man is flashing.
(Obviously, change to green if you come from a place where the green man flashes at pedestrian lights)