If you're loosing $20 worth of coins out of your pocket somewhere on the street on a yearly basis you're either dealing with a hell of a lot more coins than the average person or you're one clumsy individual.
Recently I thought I've lost a €5 banknote because some toll machines in Italy send cash[0] flying as if they were doing it with contempt.
I found it eventually along a €2 coin somebody left there. On my way back I also found a €1 coin and a 50c one. I guess people lose a measurable amount of cash this way.
[0] Non-Italian cards don't work on Italian motorways - only cash. Knowledge I acquired through error of my own so now other people don't have to.
Once they notice that someone's clogging the toll booth you receive a receipt with payment details and you have 14 days to do that after which interest starts accumulating.
In one instance in Venice though the employee preferred to argue with me over the speakerphone insisting that I "insert euro" even though I didn't have any cash one me(there are no ATMs on the motorways - something I learned that day).
His line of thinking was that I want the receipt so that I can avoid paying by never returning to Italy.
