Looks like pranksters just want to get their ass kicked these days. This prank is stupid and the reactions were to be expected.
They can wash it off with water, so he's not being an a-hole himself...
Surely inspired by this video:
A sinkhole appeared on the road in the Russian town of Tyumen. No cars fell in it but it was a close call for one of them.
He used for that a 4-minute video shot from the Washington Street bridge in San Diego and his After Effects skills. He says there's absolutely no CG elements, all the cars are real.
This is why you shouldn't let anything valuable inside your car.
Now, for the bright side: you don't have to pay for a broken window...