Above 160km/h the wind resistance can overcome the wiper mechanisms, and start to push the wipers up the screen. So after a couple of hi-speed laps of your favourite circuit, the wipers are at 45degs across your field of vision. Many older cars have non-parking wipers, so when you turn them off, the wipers stop where they stop. So if you are going to the track, you can park the wipers upright, which takes care of the problem.
Some period race cars sometimes can be seen with the wipers upright, and on the Hako's first trackday, yes, after a few laps the wipers were at 45degs across the screen. Funnily enough, in every subsequent trackday, I've forgotten about it and left the wipers at the bottom of the screen and it's been fine....
But I guess in Japan, parking the wipers upright is sorta to look like you're a badass who did 160+km/h on the way to the meet
(or...more charitably, it is a respectful nod to period racing practice). So you often see classic cars in Japan with the upright wiper thing.
And I guess if the JDM does it, then you can bet that we will too
....and for the record, it was a total mystery to me too, until the wipers started creeping up the windscreen down the straight at my first trackday, and then the penny dropped
No Kev, you are eating a duck fetus.