To be bulletproof, that would be a man without fear.  "The Hero of Harlem" Luke Cage is more than bulletproof, his skin is impervious to all forms of traditional weapons.  Bullets, knives, bottles, and even a rocket seem to have no effect.  So how could one achieve this effect without going through the hassle of being the unwilling participant of a dangerous medical procedure?   Luckily The Brain Trust has this one figured out.  Listen as we discuss body armor, cornstarch & water, skin made of spider silk, and yes, even foam!