One of the oddest things in the universe.
Hair determines your personality. If your hair is brown, you are normal. If your hair is blonde, you are an idiot. If your hair is orange / red, you are an alien and deserve to die.
Also, some people (Usually females) believe it is necessary to spend literally hours on their hair.
Hair grows everywhere on the human body except the palms of the hands, soles of the feet, eyelids, and lips.
Hair is basically dead skin. Though it should look nice, there is no point in spending half your day fixing it when it will just fall apart when you go to bed.
Hair color is just a color. It does not determine how smart you are.