Cash register nunismatics
I spent two long summers working the seafood counter at Nathans at Coney Island. One of the few joys of a retail job like that is looking for foreign coins in the cash register at the end of the shift.
I was freshly reminded of that this morning, noticing that some generous soul donated what looks like 5 shekels at the local Dunkin Donuts.
A lame startup idea occured to me: building a coin counting machine that would OCR all the coins, sorting out any coins that have a nunismatic value higher than face value.