Extrusible Bumper Goo

Ideally, a bu,per serves to absorb the kinetic energy of an impact, protecting the rest of the car. Currently, bumpers convert the energy of an impact into heat, via destruction of the bumper itself.

I propose that the kinetic energy of a collision be converted to kinetic energy of a different object, namely extrusible goo contained within the bumper. EBG-containing bumpers are like big balloons or sausages, and the goo within is a thick, vivdly colored paste. Chemically, it is a soap, and so will wash off. On collision and compression of the bumper, the EBG spews out of special weak points in the bumper, dispersing the energy provided. These weak points are angles such that a rear end collision will tend to goo the windshield of the car behind, and the rear window of the car in front for a collision with the front bumper.

Of course, faster collisions may cause goo to shoot out of other places in the bumper, akin to a stomped ketchup packet. The distance and spread of spewed goo will be helpful to forensics investigators.