How do you feel about mood rings?

I actually didn’t know what they were until you asked! A quick google search provided answers however, and honestly they sound very interesting. Wikipedia was quite dismissive of their ability to reflect mood via colour, but really those type of objects are what interest me the most - the semi mystical type of things which just work and are almost “anti science” in some cases, they really intrigue me. I’d quite like a mood ring - they sound like they have a mystical type of quality.