Just heard this and thought it was good enough to pass along:
My husband decided he was fed up with my mood swings so he thought it would be clever to get me a mood ring for Christmas so he could tell what mood I was in.
When I am in a good mood, the ring turns green.
When I am in a bad mood, the ring leaves a red mark on my husband's head.
Maybe next year the jerk will get me a diamond!