One place I worked, they processed and paid payroll twice one month because someone dropped the files again and the ESB dutifully picked them up and sent them.

One place I worked, they processed and paid payroll twice one month because someone dropped the files again and the ESB dutifully picked them up and sent them. That was a $6m mistake, took them years to work out how to reclaim the money from the workers (unions involved, contract lawyers, you name it).