The sad life of a banker

Mr. Waller's silence and absentness continued unchanged. The habit of years had made his work mechanical. Probably few of the customers who came to cash cheques suspected that there was anything the matter with the man who paid them their money. After all, most people look on the cashier of a bank as a sort of human slot machine. You put in your cheque, and out comes money. It is no affair of yours whether life is treating the machine well or ill that day.

(from Psmith in the City, by Sir Pelham Wodehouse)