Businesses are running out of pennies in the US
bbc.co.uk
bbc.co.uk
Set dates to reduce this payment, eventually to 0, thus expiring the penny.
I don't remember the exact details, but I think it was a reduced-price donut or something similar if you provided 2 rolls of pennies. (The pennies had to be rolled.)
I thought: wow, they must really want pennies.