Leasing a Car
I will let the excellent Suze Orman explain this one:
"A shiny new car every three years seems so enticing. But have you every stopped to consider the cost? If you are leasing and trading in, and then leasing again, you never own the car free and clear. You will be making monthly payments forever. That is a colossal waste of money. If you instead follow my advice and take out a three-year loan, you will own the car free and clear after 36 months. Given the dependability of cars these days, that could mean you could keep driving the car for five, seven or even more years (depends on your mileage) without having a loan payment. That gives you years when you can be saving more for other important goals — such as retirement-rather than continuing to throw money at your depreciating car."