I have an hypothesis.
You are probably aware of the fungus Ophiocordyceps unilateralis which turns ants into “zombies.” If not, check it out here.
I have become convinced that something similar is happening all around us. Somehow, a parasite has adapted itself to the human race, specifically the males. I’m not sure how it happens, but somehow this parasite finds a way into the body, probably in the adolescent period—I’m not prepared to speculate how, but suspect it’s sexual—and embeds itself, biding its time.
Then, as the victim reaches an advanced age, 60 or greater, the parasite climbs to the brain, where it compels him to go out and buy a little red truck.
Then, having purchased this vehicle, the victim takes it out on the road and drives slowly. Everywhere. In front of me.
Now, I have no idea what evolutionary advantage this gives the parasite, but I am certain that this is the only explanation for an otherwise inexplicable phenomenon.