"You could cover your car with those plastic spikes"
"Do you think we could patent them before someone else thinks of it?"

Already been done - The Cars That Ate Paris

The Cars That Ate Paris is a 1974 Australian film. Directed by Peter Weir, it was his first feature film. Shot mostly in the rural town of Sofala, New South Wales, the film is set in the fictional town of Paris in which most of the inhabitants appear to be directly, or indirectly, involved in profiting from the results of car accidents.