Tough Guy

 is a challenge perk in Fallout: New Vegas. Repeatedly breaking bones has led them to become stronger (somehow).

Effects
Limb damage reduced by 20%

Behind the scenes

 * This perk may be based on the urban myth that when bones break they heal back stronger. This known as Wolff's law. Edit: Wolff's Law is not an urban myth. The reason that this is an urban myth is that only some breaks will heal stronger than before. Others will be weaker. In general, the cleaner the break, the more likely the restored bone will be stronger.