What is rarest hair and eye combo?

As an AI language model, I don't have specific information on the rarest hair and eye combo. However, in general, natural hair colors are of black, brown, red, and blonde, with varying shades and tones within those broad categories. Eye colors also naturally occur in different shades of brown, blue, green, grey, or hazel, with variations in intensity and depth of color. The combination of rare hair and eye color can vary, and some may be more uncommon than others. One example of a rare hair and eye combination is red hair with blue eyes, which occurs in only around 1% of the world's population.