And this doesn't just happen at congested intersections, it happens everywhere. Now I complain when my brother pulls up practically on the bumper of the car in front at a light, but a couple feet is usually the norm. A car length and a half is STUPID!
Mood necklaces or rings usually contain a chemical that changes color with heat (example cold to warmer black, purple, blue, green, reddish). They then usually have a pamphlet saying what the colors mean.
The reason why the phenomenon is known as a blue moon is not certain, although according to one explanation the term means betrayer moon (belewe in Old English). On other occasions the moon can actually take on a blue colouring but these are the result of ash spewed into the sky by volcanoes.