Mood Umbrellas

Remember the mood ring you had when you were a kid? It would change colour, depending on whether your mood was happy, sad, angry, etc. Now, wouldn't that be a great feature for an umbrella? You could keep your distance from anyone with black, grey, tan or dark yellow umbrellas, since their foul mood would make them more likely to be angry or agressive with their umbrella. We could all avoid getting poked in the eye as we pass them on the street, or poked in the ribs on the bus...it would save the world from a lot of umbrella injuries! Unfortunately there is no such invention thus far...but there is an umbrella I found that changes colour when it gets wet in the rain! Check it out.