The sign in my doctor's waiting room  reads:
"Always be sure to wash your hands after handling animals, trash, litter or money"
And I imagine a religion where all currency is considered impure, so that even to hold a dollar bill in your hand is to commit a mortal sin requiring complex rituals of purification. A religion where all commercial transactions are done on faith alone, and the priests burn incense night and day, to get the smell of money out of their temples.
I imagine a superhero so incorruptible, so unimaginably pure, that the offer of the smallest coin in payment (or bribe) will act like kryptonite on his powers, sapping him of all his strength.
I imagine my fingers touching notes pulled from inside a mattress, sweaty with insomnia and love making, crumpled with greed.
 No, I'm not ill. It was just a routine check-up.