Bugatti Veyron. Insanely expensive. 1001 horsepower. Goes over 250 miles an hour and still has air conditioning and a stereo. Utterly gorgeous. I want one.
I have no idea what I'd do with it. I don't know how to drive a car that fast. The insurance would be insane. But if I won the lottery and had to make a completely frivolous purchase? That would be it.