Bought a used Taurus.

No, wait, that's the second most stupid thing I've ever done. The first was driving my old Challenger around the block without first securing its lift-off glass hood. I was only doing 20 mph, not enough to float a hood, right? Wrong! That hood came up, over, and landed flat on the road behind the car. Nobody saw me, thank God. But that was long ago, I can talk about it now...