Like the question about the car hitting a block foam, except it’s made out of Superballstuff, specially prepared polybutadiene.
So a car going about 100 km/h hits a 20-meter-thick block of Superball material. The block is 5 meters tall and 5 meters wide and braced against a cliff face (as if it matters much in this case). What happens to the car? I know it gets crumpled but how far back is that car going to bounce? Or does the plastic disintegrate with that kind of impact?
And if the question seems to absurd to ponder at least you can get a chuckle out of Homer doing some research on the subject.