In a test to demonstrate reductions to cabin turbulence in the 3-series convertible, BMW convinced Dutch model Sylvie van der Vaart to sit in two 3-series convertibles while a wind tunnel generates a 37 mph air stream. The first car is a 1987 model, while the second is the current 3-series. van der Vaart adopts period clothing and hair style for each of the cars, and we get to see her flipped hair swishing every which way in the older car. And, of course, in the new car her hair is completely unruffled.
The lesson: Don't buy a 1987 BMW 3-series convertible if you have hair issues.