A businessman walked into a bank in San Francisco and asked for the loan officer. He told the officer that he is going to Europe on business for two weeks and needed to borrow $5,000. The bank officer explained that the bank needed some kind of security for such a loan. So the businessman handed over the keys to a Rolls Royce parked on the street in front of the bank. Everything checked out, and the bank agreed to accept the car as collateral for the loan. A bank employee drove the Rolls into the bank's underground garage and parked it there.

Two weeks later, the businessman returned, repaid the $5,000 with interes, which came to $15.41. The loan officer said, "We are very happy to have had your business, and this transaction has worked out very nicely, but we are a little puzzled. While you were away, we checked you out and found that you are a multimillionaire. What puzzles us is why would you bother to borrow $5,000?" The businessman replied, "Where else in San Francisco can I park my car for two weeks for only 15 bucks?"