Question of the day: how much hydrodynamic drag does a Ford Focus' backside have? According to Professor Google, the answer's simple: F = 0.5PV²Cdf.

Sadly, we have neither the time nor faculties to work it out. And we're not entirely sure what F stands for.

Luckily, we did find this video; it's a Canadian sewer geyser erupting onto the rear end of Ford's mid-level four-door, shooting it into the air. Which answered our question beautifully: NOT MUCH.

It also looks uncannily like the Focus is suffering from a violent bout of the trots.