I love looking at the wheel wells when its raining. You can see how much trapped air is in there in some cars, while in others (usually sport cars) all the excess water simply goes backwards "sticking" to the fender and door.
When I took the mirrors off of my Mazda, I noticed that my side windows were super clear when raining since the mirror didn't block off airflow- another not so scientific observation but cool non the less (and removing the mirrors did improve my mpg by about 3-4mpg's, so seeing it work in the rain is kind of magical)
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