Silver or Chocolate?

Earlier in the semester, I posed a question to my class about whether they would rather have a gallon of water or a "gallon" of diamonds in an attempt to illustrate the water-diamond paradox.  Almost everyone chose the gallon of diamonds, reasoning that they could sell the diamonds and buy a gallon of water, among other things.

But here's an interesting thing: someone actually offered people a deal very similar to this.  Would you rather have a ten ounce bar of pure silver or a king size bar of chocolate?  Shockingly, everyone picked the chocolate!  Check out the video below: