I came across this on SnootLab's website http://shop.snootlab.com/lang-en/parts/101-choc-sensor.html.
At last! a Chocolate sensor!
I wonder what the range is. You know, for those times when your wife hides the chocolate. 
This is pretty funny - it took me a small bit to understand what the sensor was really for; lol for engrish! I really wish it was a chocolate sensor; though I have no need for one, knowing such a thing existed would make my new year a bit brighter!
Well, this sensor would in fact sense a chocolate bar being dropped on it. 