Remember the "mood ring" fad of the 70's? Supposedly, the thermochromic element, which was usually liquid crystal, changed the ring color in response to body temperature. The color apparently indicated the emotional state of the wearer - mad, sad, jewelry-challenged...

Now there's "Magic Gloss" by NYX Cosmetics, the mood ring of make-up. It's goes on completley clear and reacts to each person's unique skin chemistry to produce a custom shade of pink. On me, it turns a lovely almost sheer red; on my girlfriend its a pink-based color.

Only $4.50 for a tube at NYX. The most fun you can have with a lip gloss.