Oh....

Why do people put these things on their cars?? I would love to say the chap that got out of this Ford Mondeo was 17 dressed in trackie bottoms and a baseball cap(sweeping generalisation) but sadly a grown up got out. It is a homemade spoiler I think, judging by the bolts driven through the boot lid.
I am not a racing car designer but........A spoiler is an automotive aerodynamic device whose intended design function is to 'spoil' unfavorable air movement across a body of a vehicle in motion, usually described as turbulence or drag. Spoilers on the front of a vehicle are often called air dams, because in addition to directing air flow they also reduce the amount of air flowing underneath the vehicle which generally reduces aerodynamic lift and drag. Spoilers are often fitted to race and high-performance sports cars, although they have become common on passenger vehicles as well. Some spoilers are added to cars primarily for styling purposes and have either little aerodynamic benefit or even make the aerodynamics worse.Spoilers for cars are often incorrectly confused with, or the term used interchangeably with, wings. Automotive wings are devices whose intended design is to generate downforce as air passes around them, not simply disrupt existing airflow patterns. I'm fairly sure this car was not nor ever will be in need of such a device!! :-)