[shovel]

I was thinking about this a while ago, not so much a portable smoke machine for aero while driving, but rather find a windy day and a flat place to park, try to face the wind's general direction to the best of your ability, and then mount your tuft on the end of a wand and try to look for patterns while moving the tuft around from outside the car.

But then I got tired of thinking about that and went back to my usual thinking about burritos, and about the anatomic features of women and so forth