Ancestral remains of our behaviours, our will can't control these reflexes :
GOOSE BUMPS :
We don't have many hairs anymore, as cavemen did, but they still rise when we're angry or afraid of something as would do cats' ones to double in size. Even if it doesn't make people afraid anymore, the body keeps doing its intimidation process.
BLUSH :
Also when we're angry or afraid of something, we "project" some red on our faces and our necks (the body part the most seen) to protect ourselves and scare people.
