I once attended a workshop about money. One of the exercises our group of 50 had to do was chew a brand new $100 bill. Most of us gagged.
The purpose of the exercise was to demonstrate that money – the thing itself – is neutral. Pieces of paper, diamonds, chunks of gold to which we assign a cultural worth have no direct value in nourishing us, keeping us warm, or sheltering us. In this exercise, money even turned out to be disgusting.