[iuygtrftghyujik]

Something like this happened in Belfast a few years ago. Terrorists (or loveable rouges if your American) robbed a bank and accidentally stole $50M - they hadn't realised how much was in the boxes. The bank simply changed the design of the notes making them worthless.

But when the bank issued the range of stolen serial numbers it forgot that a small local firm had paid it's wages in cash from the same batch earlier that day. For weeks there were Police raids on small corner shops when a little old lady used a 'stolen' note.