The lovely Lady Budster reckons that the BMW/Audi style of driving is due to their owners being poorly endowed.
There may be a link here - to those funny little wierdly painted hatchback cars, whose doors and other panels suffer from strange resonances whenver the 'stereo'

is deployed...
A lady friend believes the size of the vehicle's exhaust is inversly proportional to certain parts of the driver's anatomy...
