A couple weeks ago I noticed some strange skidmarks on the freeway near here. They're dark, as if some serious rubber was burned, and they loop all around, changing directions, spanning several lanes, going both with and against the direction of (legal) travel. It looks, at first glance, as if an 18-wheeler fishtailed and spun around madly for a while, but it's hard to imagine how a legitimate accident could have achieved such a complicated skid pattern.
Today I saw another skid pattern, a half mile west of the first one. This one is more straightforward: it's a spiral about the radius of a car, looping over itself several times, with one tail leading off to the side of the road.
I assume this means someone's doing doughnuts on the freeway at night. Is that, like, a thing that people do?