A man walks into a New York City bank and says he wants to borrow $2,000 for three weeks. The loan officer asks him what kind of collateral he has. The man says "I've got a Rolls Royce, keep it until the loan is paid off, here's the keys."
The loan officer promptly has the car driven into the bank's underground parking for safe keeping, and gives the man $2,000.
Three weeks later the man comes into the bank, pays back the $2,000 loan, plus $10 interest, and regains possession of the Rolls Royce. The loan officer asks him, "Sir, if I may ask, why would a man who drives a Rolls Royce need to borrow two thousand dollars?"
The man answers, "I had to go to Europe for three weeks, and where else could I store a Rolls Royce for that long for ten dollars?"