You have maybe heard of the Race Track in Death Valley. Where, when the playa gets muddy and slick, and the wind blows, the rocks scoot across the ground, leaving tracks.
There's one nearby, too. I went and tried to get a picture of it today. I haven't unloaded the camera yet, but I don't think it turned out well. It'll be overexposed and the edges will be blurry. *sigh*
Anyway, it's near Tulelake