Color

I really have no idea why, but my facial hair comes in a different color than my head hair. In fact, my facial hair comes in a kind of reddish brown color. My normal hair is a dirty blonde/brown color with no visible red. It makes for some very interesting conversation, as far as I know I don't have any Irish or British in me (as the British Isles have the highest concentration of red hair on the planet). I've actually heard from a number of people that tell me their facial hair is coming in a different color than their normal hair.

I wonder why these hairs are colored different, is it because they don't show themselves as often, or maybe something genetic?