Yes, the gold-chocolate ratio: more specifically, the number of Hershey bars one hundredth of an ounce of gold will buy. Richard Bloch has done it over at Seeking Alpha, and the ratio shows that gold's value has increased quite a bit in terms of chocolate bars recently.
Since Hershey's adjusted the weight of its bars over time, Bloch also graphs the number of avoirdupois ounces-equivalent 1/100 troy oz. of gold can buy:
He also does the same thing with pounds of Corn Flakes per 1/100 oz. of gold. That ratio hasn't hit the same extremes lately.